Pk Earth? I think the word your looking for is PK Ground 
Why not give Lucas moves he actually had? Lucas's down B could reduce knock back from certain attacks for X amount of time or have a greater damage output for a certain amount of time, or some other utility move. Or we could give him an extra item to use idk. It just seems better to add a Mother character in the game who actually used offensive psi rather than give the characters moves they never used before
EDIT: Why not give him refresh to rid himself of item's secondary effects (or reverse them). Ie instead of the flower giving you damage, the damage it gives you is actually subtracted from the damage you have now. It would be an original way of health recovery to use.
Why not give Lucas moves he actually had? Lucas's down B could reduce knock back from certain attacks for X amount of time or have a greater damage output for a certain amount of time, or some other utility move. Or we could give him an extra item to use idk. It just seems better to add a Mother character in the game who actually used offensive psi rather than give the characters moves they never used before
EDIT: Why not give him refresh to rid himself of item's secondary effects (or reverse them). Ie instead of the flower giving you damage, the damage it gives you is actually subtracted from the damage you have now. It would be an original way of health recovery to use.