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Castform (Snowy) is an Ice Pokémon. It is vulnerable to Fighting, Rock, Steel and Fire moves. Castform's strongest moveset is Powder Snow & Weather Ball and it has a Max CP of 1,632.
"Castform's appearance changes with the weather. This Pokémon gained the ability to use the vast power of nature to protect its tiny body."
Powder Snow is the superior fast move due to its much faster energy generation, which lets Castform spam its powerful charge move.
Weather Ball can be used very frequently with only 35 energy cost, and deals considerable damage with STAB. This alone is enough for Castform simply due to how cheap and effective it is compared to its other charge moves. Since Castform lacks any coverage moves, it is not necessary to unlock a second charge move. Ice Beam and Blizzard cost too much energy for their damage; it's better to just spam Weather Ball.
Snowy Castform is a mono-Ice type with above average bulk, and is fun to play but very vulnerable. Mono-Ice type is one of the worst typing combinations in the game, with no resistances against any other typing other than itself, and simultaneously being weak to four. The only perk of Snowy Castform is its very spammy moveset, which is terrific against Pokemon weak to Ice or those who lack sufficient bulk.
Snowy Castform lacks stats for anything outside of Great League.
Certain Pokemon in Master League do possess a double weakness to Ice-type attacks, but Snowy Castform can't win through typing advantages alone.
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