Thank you for replying; It wasen't to pin you down, I was just curious. Other hard ones would probably be Electrode, Weezing, Unown, etc. Bastiodon should be really easy for you [link] Also may I suggest Togekiss/Togetic?
Haha its okay. Thanks for the suggestions too I was thnking of togepi and togekiss as well... but I already made a togepi (not a square) one already so I wasn't into making another one ; I may not do anymore pokesquares for now since I'm working on eevee evolution bookmark set ;3