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Even the heavy ball fails in dynamax raids and results in failed catches. Would be horrible if that effect carried through to normal battles since it'd completely ruin the viability of weight-based moves since anything can dynamax.
Probably low-key gets minus and amped-up gets plus so don't hope for anything awesome. They seem to have 2 different moves, shift gear + venoshock or magnetic flux + venom drench. This is according to: https://www.diffchecker.com/BdvZjy84