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yeah I use a set with spikes, stun spore, grass knot and hp fire. also don't give me the credit for that team basis as it is from Faladran and I saw it on pokemoshpit
shaymin could wal,l the problem would be recovery, as even nc + rest is predicable after rest. I would use roserade. with ston spore, sleep powder, spikes, t-spikes and synthesis and high bas spd it works.