Question

From generation I-V and all their effects

Answer 1

I don't know why people ask questions like this...

• Bulbasaur: Chlorophyll (Raises Speed during in Sunshine)
• Charmander: Solar Power (Raises Sp. Atk in Sunshine but lowers HP)
• Squirtle: Rain Dish (Gain 1/16 HP every turn in Rain)
• Chickorita: Leaf Guard (Immunity to Status' in Sunshine)
• Cyndaquil: Flash Fire (When hit by a Fire attack, it powers up its own Fire attacks)
• Totodile: Sheer Force (Boosts power of moves with a secondary effect by 30% and removes the secondary effect.
• Treecko: Unburden (Doubles speed when your item is lost)*
• Torchic: Speed Boost (Raises Speed every turn)
• Mudkip: Damp (Prevents self-destructing moves)
• Turtwig: Shell Armor (Immunity from Critical hits)
• Chimchar: Iron Fist (Boost power of punching moves)
• Piplup: Defiant (When its stats are lowered, its Attack will rise)
• Snivy: Contrary (Stat changes will have the opposite effect
• Tepig: Thick Fat (Raises resistance to Fire and Ice attacks)
• Oshawott: Shell Armor (Immunity to Critical hits)

I hope this helps in whatever way you need it to!
* Thank you for the note Lucario.

Comments

Unburden raises Speed if you use your item.

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Also, personally, I think the most useful are Squirtle's Rain Dish for rain,  Torchic's Speed Boost for Uber Blaziken, and Snivy's Contrary for Leaf Storm.

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I don't know, Lucario... Charmander's Solar Power can be devastating when used with Choice Specs on a sun team, Treecko's Unburden is nice for a SubBerry strategy and Totodile's Sheer Force gives a nice power boost for things like Waterfall, Ice Punch and Crunch.

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Good point, all of them are pretty useful in one way or another :)