In my ruby game, I have 6 L100 blisseys only knowing tail whip and in my sapphire game, I have 6 L100 gardevoirs only knowing memento, so I exchange records with emerald for both.
Here are also some great setups for EV training:
hp: 6 azumarils that only know tail whip
attack: 6 victreebels that only know growth
defense: 6 poliwraths that only know rain dance
sp.att: 6 gardevoirs that only know memento or
6 vileplumes that only know sweet scent
Sp.def: 6 dustox that only know string shot
speed: 6 jumpluffs that only know splash