Virizion is quite good as a Helping Hand user, thanks to its immense special bulk. Unlike other HH users, however, Virizion also maintains an offensive presence, thanks to its solid STABs and 108 base speed. Terrakion is also good for the latter reason. If it's a more dedicated Helping Hand user you're looking for, I can only echo the others in saying Cress is probably the best, but Latias and Musharna are also worth considering.
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Just waitin' for June 2nd now...
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