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Thank you for your advice. I have tried all four pokemons but it is not very effective. The strategy I often encountered is that they throw the Arceus in (e.g., spin block, fighting move predicted, hazard laying etc) and then Substitute when I switch pokemon:
Chansey is totally useless against...
Can someone please tell me what the best counter of Arceus Ghost Calm Mind/Sub/Judgement/Focus Blast other than a defensive Ho-oh? Ho-oh is good, but it doesn't fit my team. Thank you in advance.