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On pokemon r/b/g/y they werent so expensive.
But the game corner probably wasnt really designed for collecting coins to win prizes. It was probably just for fun.
If my pokemon is level 17 and it has 252 evs in SpAtt, are those evs visible in the pokemon's stats summary? If not, are the evs still there? If so, do I need to bother ev training it in SpAtt anymore, can I just train it normally?