YamiiDenryuu
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- Aug 27, 2011
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But there is the matter of the Battle Box -- Pokemon here can't be modified in any way as long as they are in it. I've never used it personally, but if it simply makes a "copy" of the registered Pokemon (the actual Pokemon remaining in your party or PC box) then yes, any EV grinding done in single player mode will not affect what's registered in the Box.
No, it's just another way of storing your Pokemon. If they're not locked into the Battle Box due to you entering a tournament, you can easily take them out, change moves or EVs or the like, and put them back in.