I actually really like that idea. You definitely beat my Christmas Tree with that one. xD
I actually think a Christmas Tree Pokemon would be a complete disaster. All you'd really be doing is putting a string of lights around an Abomasnow and calling it an Electric Type.
Wait. Wait. I've got this. How about...Abomasnow Christmas Tree Form? Oh I'm so clever.
I'm pretty sure a sea anemone isn't even a plant though. I'd say it would have to be a Water/Electric type.
EDIT: Oh, and for the Electric Poison types I see what they're trying to do, but I think it needs a serious change to it's colour scheme. xD