This part can be applied to both Appletun and Flapple, actually. Whenever it reaches a certain HP (75% or something), the pokemon gets a random berry, ranging from a simple Oran Berry to even a Yache Berry. If the berry is used, another will generate after it goes below the target HP, or wait a turn or two for it to regenerate, allowing for moves like recycle to be of some use.
Appletun Crest: Significantly decreases damage from Ice and Fire type moves and removes the ability to get frozen or burned.
Flapple Crest: When this Pokemon gets its stats lowered, attack is ra