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>generally early enough in the game to carry with you all the way
>almost nothing in the game uses grass attacks, essentially zero weaknesses
>L20 evo
>naturally learns earthquake
>ability allows the most common type in the game to heal it
>very helpful Electric immunity
>its evo is potentially the third pokemon you find in Colosseum, comes with Surf which is god tier in a game with only double battles
>line is always early on in PMD, a place where Damp halts one of the most damaging kind of traps and where room attacks (like Blizzard and Earth Power) reign supreme
If you choose Wooper, you'll not choose wrong.