Under the desk!
route 110
Plusle can be found and caught on Route 110.
It is the route with the cycling road. It lies between Mauville City and Slateport City.
on route 110 on the low road after you fight your rival he/she gives it to you
go to the cycling road/route 110 and walk on the grassy road.
New Mauville is located on Route 110, underneath Cycling Road.
North of Slateport city on route 110.
His house is on route 110 it is kind of big and purple
Go north of slateport..then the route there is route 110.
you find it on route 110
The trick house (I believe) is located on Route 110. If you manage to get pass all his tricks, you win a prize. In the end of it, he'll give a Tent to decorate your Secret Base. If you're playing Sapphire, you'll get a Blue Tent, and if you're playing Ruby, you'll get a Red Tent.
Go In Stern's Shipyard At Slateport City And Talk To An Old Man Named Dock