Is the Mothra Tama supposed to be this hard?

[Birbplant]

Try as I might, I can only get Mayura

 

[Tamagotchi1200]

older tamagotchis like that are very hard, for example the angel, or the ocean are hard

 

[clearperspex30cmrule]

tbh ive found mothra easier than angel (can feed a snack to increase happy, not game-only) and way easier than ocean (no predators or random dying)
im running mothra currently actually and its at mothra leo stage ^_^