Egg morty, the one true morty HELP

I never finished de campaign and never had egg morty, so I know you have to level UP to 20, but I play online multiplayer and im level 30 and I have egg morty but is level 54 so I level UP to 56 do I have to level UP to 74???? O how can I turn it to the one true morty?

It's different in multiplayer; you'll need a total of 11 Egg Mortys so you can combine them at the Morty Daycare.