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Psycho Boost is a move only Deoxys gets (that's probably why you don't know it). It's like Overheat, but a Psychic version - high attack power (140), but lowers your Special Attack score.
ahem? O.o; Jackson148 I think that the gameshark rooted in your brain for a little too deep... either it is that, or you got mixed up with psychic (which doesn't sound very possible). Psycho boost is Deoxys's signature move, and no one else can learn it besides Smeragle who can learn anything anyway.
Err... closest to everything. It can't learn Explosion, Memento and Self-Destruct. I believe that's the only moves that Smeragle cannot learn (Volt Tackle is only a matter of time for Smeragle).