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i think it evovles around lvl 50 or something

for your togpie to evovle to a togichick you need to give it special items found in the goldonrod city compartment level 5. there are items like zinc and stuff give that to togipie, keep togipie in the front of your party and give it haircuts (haircutters in goldorod city undergound) keep doing that it will evovle in no time. But trie not to give it berries and potions take it to a pokemon center

(it dislikes potions and berries and other revivle stuff)

hope i helped