I would like to ride on Pidgeot, Giratina, Rayquaza, Latias, Charizard, Flygon, Hydreigon, and Kyurem, Reshiram, and Dialga on air.
on water it would be Kyogre, Lapras, Gyarados, and Lugia(in air too)
And on land would be Raikou, Luxray, Drapion, Arcanine and Virizion