If you have the candies and don’t mind using a quarter of a mil stardust.. it’s the best ice attacker and Rayquaza is bound to drop by again before Gen 4 hits.
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I have ~300 candies for it, but im also afraid mamoswine will be the best ice attacker when gen 4 drops so it might be worth powering up a bit
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Do both. Jynx doesn't get LESS good. Mamoswine just might be MORE good.
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Do note that you'll need to TM it to double ice moves - that may affect your decision.