Little known fact, TRs can be held, and can be used with Fling. When thrown with Fling, the base power of Fling is the base power of the move taught by the TR. TRs with status moves have a power of 10, but TRs with attacking moves have varying base powers, with TR43 & TR71 having the coveted base power of 130, only previously obtainable by having an Iron Ball.