via pret/pokeemerald (and pokeruby); rate is set at 50%
swarm pokemon have the ability to have 4 fixed moves, so derive from
EncounterSlot to have moves, and remove special handling from
VerifyCurrentMoves (now picked up by IMoveset pattern
allows hgss safari mons regardless of frame call (table is currently all
Slot=0).
may need separate handling down the road:
* switch slot number to an enum for slot codes (>0 = slot number, less
than -> do something else).
not something im interested in right now
