Just use fire/fighting moves to KO magnamite and magnaton.Use marshtomps mudshot to take down voltorb and manatric
Ground types are perfect to beat Watson like sandshrew.
Fighting and bug type should do the trick
the trick is to use the highest lv of water or ground Pokemon you have
How Watson Learned the Trick was created in 1922.
water or fire type on a high level (above his)
After you beat the Trick Master's puzzles, he is gone. If you want to see him again, you need to go out of the house and then back in.
just go to the gym and beat Watson with his electric Pokemon
beat trick master 5-8 times
Always turn right
10 or more.
beat the Trick Master's in the Trick House. he will give you a Magnet, i don't remember which puzzle.Read more: On_Pokemon_Emerald_how_do_you_get_a_Magnet
Any fire type should do the trick