To unlock Survival Mode, beat the first 150 stages of the game, the original 150 stages present in the game. Survival Mode is a stage-rush mode in which you consecutively play (mostly) random stages with the same set of Pokemon, with periodic rewards earned therein. It will cost 3 Hearts to play. Note that Survival Mode is only present on v1.3.0 of the software and above.

Mode	How to unlock
Exp. Booster L	Beat Level 20 of Survival Mode (earned one time only)
Exp. Booster M	Beat Level 20 of Survival Mode (also earned one time for beating Level 10)
Exp. Booster S	Beat Level 10 of Survival Mode.
Level Up	Beat Level 35 of Survival Mode.
Level Up	Beat Level 45 of Survival Mode.
Raise Max Level	Beat Level 30 of Survival Mode.
Raise Max Level	Beat Level 40 of Survival Mode.
Raise Max Level x3	Beat Level 50 of Survival Mode.
Survival Mode	Beat Stage 150 (Mega Mewtwo Y)