If you're here, you probably don't know the type weaknesses and resistances. Also, maybe you don't know that when a pokémon uses an attack of its type, like if an elecrtic pokémon uses an electric attack, the damage is multiplied by 1.5. Well, here are the types:
Normal is a plain type. Some people say it's useless, but others say it's great. I'd say Normal type pokémon are good, many of them have good status and they have only one weakness, Fighting, and are competely immune to Ghost, although they resist no other type. Normal type attacks, however, are not as good. No type is weak to them, but Ghost is immune to Normal and Rock and Steel resist it. But Normal attacks can be the solution to your problems anyway, as most pokémon can learn Normal attacks and many of them are strong. The Normal type is a physical type, so all Normal attacks are counted as physical attacks.
Fire is a "hot" type. Fire is a powerful type that should be on every team. Scizor and Forretress, both very common in teams, are only weak to Fire. Fire is super effective on Bug, Steel, Grass and Ice and is not very effective on Fire, Water, Rock and Dragon. No type is immune to Fire. Water, Rock and Ground are super effective on Fire pokémon and Fire, Grass, Bug, Ice and Steel are not very effective on them. The Fire type is a special type, so all Fire attacks are counted as special attacks.
Water is a very useful type. Water is super effective on Fire, Rock and Ground, it is only not very effective on Water, Dragon and Grass, its only weaknesses are Grass and Electric and Ice, Water, Fire and Steel attacks are not very effective on Water pokémon. The Water type is a special type, so all Water attacks are counted as special attacks.
Electric is an EXTREMELY useful type. It is super effective on Water and Flying, two VERY common types, and its only weakness is Ground. Electric pokémon resist Flying, Electric and Steel attacks but Electric, Grass and Dragon resist Electric attacks and Ground pokémon are completely immune to them. The Electric type is a special type, so all Electric attacks are counted as special attacks.
Grass is a nice type. Grass attacks are super effective on Water, Ground and Rock, but they are not very effective on Poison, Fire, Grass, Flying, Bug, Dragon and Steel. Grass pokémon are weak to Fire, Bug, Poison, Flying and Ice, but they are resistant to Water, Electric, Grass and Ground. The Grass type is a special type, so all Grass attacks are counted as special attacks.
Ice is a good type. It is weak to Fire, Fighting, Rock and Steel and resistant to Ice. Water, Ice and Steel resist Ice attacks and Ice is super effective on Flying, Grass, Ground and Dragon. Ice is a special type so all Ice attacks are counted as special attacks.
Fighting is a good type, just for the reason that Fighting is super effective on Normal. It is also super effective on Ice, Rock and Steel, but it is not very effective on Flying, Bug, Poison and Psychic and does no damage on Ghost. Fighting pokémon resist Dark, Rock and Bug, but are weak to Flying and Psychic. Fighting is a physical type, so all fighting attacks count as physical attacks.
Poison is one of few types that don't have the same strengths and weaknesses in Red, Blue and Yellow as in Gold, Silver and Crystal. In R/B/Y, Poison is weak to Bug, Psychic and Ground, resists Grass, Fighting and Poison, is super effective on Bug and Grass, and not very effective on Poison, Ground, Rock and Ghost. In G/S/C, Poison is super effective on Grass, not very effective on Poison, Ground and Rock, Steel is immune to it, Ground and Psychic are super effective on it and it is resistant to Bug, Poison, Grass and Fighting. Poison is a physical type, so all Poison attacks are counted as physical attacks.
Ground is a must in all teams, as it's the only thing that is super effective on Electric. Ground also is super effective on Poison, Rock, Fire and Steel and is immune to Electric and resistant to Rock and Poison. It is not very effective on Grass and Bug and does not damage at all on Flying. Ice, Grass and Water are super effective on Ground. Ground is a physical type, so all Ground attacks are counted as physical attacks.
Flying is a neat little type. It is immune to Ground and resists Fighting, Bug and Grass, but it's weak to Electric, Rock and Ice and it's not very effective on Rock, Electric and Steel. Flying attacks are super effective on Fighting, Bug and Grass. Flying is a physical type, so all Flying attacks are counted as physical attacks.
Psychic is a VERY strong type. It is only weak to Bug, Ghost and Dark (only Bug in R/B/Y), resists Fighting and Psychic, is super effective on Fighting and Poison, and is only not very effective on Steel and Psychic, but does no damage on Dark. In R/B/Y, Psychic was immune to Ghost. Psychic is a special type, so all psychic attacks are counted as special attacks.
Bug is a strange type. In Red, Blue and Yellow, the only damaging Bug attack was Leech life, and in Gold, Silver and Crystal, there are only two more: Megahorn, which only Heracross learns, and Fury cutter. Also, in Red, Blue and Yellow, it is both weak to and super effective on Poison, but neither in Gold, Silver and Crystal. Its other weaknesses are Fire, Rock and Flying. It's also super effective on Psychic, Dark and Grass. It resists Ground, Fighting and Grass, and Fire, Fighting, Flying, Ghost and Steel resist it. Bug is a physical type, so all Bug attacks are counted as Physical attacks.
Rock is weak to Water, Grass, Fighting, Ground and Steel. It resists Normal, Fire, Poison and Flying. It is super effective on Flying, Bug, Fire and Ice and not very effective on Fighting, Ground and Steel. Rock is a physical type, so all Rock attacks are counted as physical attacks.
Ghost is a scary but rare type, as only two pokémon families are Ghost types. Those are the Gastly family and Misdreavus. Ghost is weak to Ghost and Dark and it's the only type with two immunities, Fighting and Normal. Ghost pokémon resist only Bug in G/S/C but also Poison in R/B/Y. Ghost attacks are super effective on Ghost and in G/S/C also Psychic and not very effective on Dark and Steel. Normal is immune to Ghost and in R/B/Y, Psychic was too. Ghost is a physical type for some reason, so all Ghost attacks are counted as physical attacks.
Dragon is a strong type. Only the Dratini family and Kingdra are Dragon types. (urgh... Kingdra looks like it's some drunk guy that can't keep his tongue in his mouth...) Well, Dragon is only super effective on Dragon, but it's also only weak to Dragon and Ice. Dragon is only not very effective on Steel. Dragon resists Fire, Water, Electric and Grass. Dragon is a special type, so all Dragon attacks are counted as special attacks.
Dark is a "new" type. It is weak to Bug and Fighting, immune to Psychic, resistant to Ghost and Dark, super effective on Psychic and Ghost and not very effective on Dark, Steel and Fighting. Dark is a special type for some really, REALLY strange reason, so all Dark attacks are counted as special attacks.
Steel is a strong type. It is "new" like Dark and it's resistant to Normal, Grass, Ice, Flying, Rock, Ghost, Dragon, Dark and Steel, it is immune to Poison, weak to Fire, Ground and Fighting, super effective on Rock and Ice and not very effective on Electric, Fire, Water and Steel. Steel is a physical type, so all Steel attacks are counted as physical attacks.
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