OMG Shuckle RULES
um..dunno if this would still be good
but here's what I used on shuckle in cystal version
Shuckle
(any nature that boosts defense)
@Sitrus Berry
Rest
Toxic
Constrict
Sand Storm
with those moves Shuckle can generally take out a lot of pokemon
I dunno what it's pokemon ability is for ruby/sapphire/leaf green/fire red
but if it has something that boosts it's defense this thing rocks
um...with the exception of water pokemon, steel pokemon or pokemon
that do specific damage moves i.e. sonic boom, dragon rage, nightshade
it should be able to take most hits.
anyway yeah so good luck , and hope I helped.