The term for someone who steals crops is a "crop thief" or a "crop poacher".
It is called theft or embezzlement when someone steals money from another person.
Robber
When someone steals your pokemon.
A pecuniary thief is a person who steals money, as opposed to one who steals property or, today, identities. someone who steals money.
"Someone who steals bark? -- tree mugger" "What does a tree say when it doesn't want to be bothered? -- Leaf me alone"
Cry.
When someone steals your pokemon.
You are doomed to hell.
Cut their hand OFF!
Pirates?
Punch them in the face