how do you lot get trade tokens in clash royale?

one thing to know: the token's rarity has to match the card. a legendary token only trades legendaries, so a common token can never get you that champion. check which rarity you're holding before you list anything.

mostly from clan war rewards and the pass, with the odd one in shop offers or event rewards. you can't really farm them, so the trick is just not wasting them. save them for legendaries or champions you actually play, trading commons with a token feels good in the moment and then you've got nothing when someone in the clan finally lists the card you want