Having easy access to changing a monster's move set gives users the ability to play around with their monster and include many different tactics into fighting and will lead to more competition, and if PVP rewards get better that would combine with the extra competition to make the game more enjoyable than ever. Making it something stupid like 20 gems or just any amount of gems for that matter does nothing but restrict (I mean, 20 gems isn't hard to get F2P but still).
And if anyone would like to justify making move prices 20 gems when all it does is discourage potential pros from the game who don't want to spend their time doing boring and repetitive dungeons and watching ads even though the ads just crash the game sometimes on an LG K4 phone (terrible phone, I know) that'll be completely fine by me.
PS: the gem tasks (i.e install a game etc) don't do anything for me and I tried contacting both Fyber and supersonic to no avail. I don't really care any more but I'm just saying.