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Scarf Tsareena? It surprised me. I've noticed Tsareena is an excellent pokémon, I'm going to test it. Also I've seen many VGC teams with it on the team preview, I'm curious :P
It's alright. During the Kanto x Alola tournament it only really handled Mimikyu and was useful for giving the Attack drop to switch-ins. I really wish it got more moves. Good against Garchomp too.