What you must realize is the fact that Regice is a pro in special defence and amazing in special attack. So use special attack moves. I would recommend:
-Ice beam
-Thunderbolt
-Focus Blast
-Ancient Power
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You catch regice
i think the best moves are take down and you shouldd add moves with TMs!
Regice is not obtainable in Pokémon Diamond.Regice isn't in diamond.
I think the best moves for a Cubone are Bone Rush, Bonemerang, and Bone Club.
the best moves for gyrados are rain dance, hydro pump, earthquake, and thunder