Tips (REDUX)

Full keyword list:

Pred, Prey, Escape, Food, Diaper, Shiny, Litten, Rowlet, "i love you", "fuck you", and "dispose me" (diaper only)

Secrets:

1 - Change color
2 - Enable diaper
3 - Show variables
4 - Change backdrop
5 - Diaper disposal ending
6 - Insta-digestion (Pokeballs only for now)

How to gain the secret ending

First, enable the diaper. Then SLOWLY feed Popplio more than 4 items (ONE AT A TIME UNTIL THE FOOD ITEM IS DIGESTED the game doesn't currently support eating more than one thing at once), and make sure to rub their belly and diaper to gain enough 'love'.
When you see the words "YOU ARE OFFICIALLY A POPPLIO LOVER :D", press 5 and watch Popplio dump out what remained of those Pokeballs! (Or you, if you ask nicely)