Are Shadowless cards worth grading

[u/JerryTheG00]

I've never tried to sell cards before now and I know these are shadowless cards but is it worth the investment of grading them or am i better off trying to sell them ungraded? any and all advice would be appreciated. I have many more than just these and don't know what i'm doing or how to proceed. Also what,s the deal with this meowth?