Pokemon emerald help?

Question

I need methods to kill a level 69 Shuckle with a level 66 Swampert, a level 69 Aggron, and a level 60 Grumpig. Their movesets are :

Swampert: surf,blizzard,earthquake,hyper beam.

Aggron: thunder, thunderbolt, dragon claw, fire blast.

Grumpig: focous punch, dynamic punch, bounce, psychic.

Answer 1

start out with grumpig first,use bounce, if it dies, switch to swampert,use earthquake,then if you are lucky use blizzard,if it too dies,use aggron's fire blast since its super effective against shuckle