That`s what happens when you feed them the last wheat to tame them!

To tame them you will need arround 5 Pokeballs(about 10 wheat prior to v0.3). Go up to them with the Pokeball/wheat in your hand and right click until you see a bunch of hearts. Since 0.4 Damage, level, and the type of pokeball you use also effect your chances of taming a pokemon

Then you can change your new friends name with your pokédex!

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