The Power of Z!
I have a hard seeing Mimikyu willingly working with its archnemesis, even if its own life were at stake and despite Jessie's wishes. It clearly acts according to its own will, especially where Pikachu is concerned; it attacked Pikachu and Togedemaru without waiting for Jessie's orders, and it came out of its Pokéball on its own when Team Rocket were trying to mess with the mall's security system. Given that Team Rocket's Pokémon tend to be very loyal to them and bond with them, it's actually interesting that Mimikyu seems to just be putting up with them and dances to the beat of its own drum.On a side note, I'm wondering how Mimikyu will react when the inevitable enemy mine between Team Rocket and the twerps occurs. It already contrasts Inkay, Pikachu's last TR opponent, in most regards, it would be amusing if Mimikyu actually refused to work alongside Pikachu over even saving it's own skin, compared to Inkay actually being the first TR Pokemon to initiate one with him by himself.