He is noted for playing Ted Mosby 's future son Luke Mosby on `` How I Met Your Mother '' , Justin Russo in `` Wizards of Waverly Place '' and Larry on `` That 's So Raven '' along with Rudy Ising in `` Walt Before Mickey '' .
He is known for playing Ted Mosby 's future son Luke Mosby on `` How I Met Your Mother '' , Justin Russo in `` Wizards of Waverly Place '' and Larry on `` That 's So Raven '' . He also played Rudy Ising in Walt Before Mickey .