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Sceptile just needs SOMETHING. Its movepool does not match its stats and it does not make the most of its Hidden Ability either. Even Mega Sceptile has these issues.
If we're limited to just changing its stats, simply swapping its Attack and Special Attack alone would really help it out. Same applies to Mega Sceptile.
Reaching beyond stat changes, giving both forms new abilities would be great, too. Sharpness or Technician for base Sceptile, then either one those or Regenerator for Mega Sceptile.