While much of the imagery on the official website
features fathers (?) and their children (??) riding Pikachu in the fake grass (???), and it specifically mentions that adults up to 100kg (220 lbs) can bounce on Pikachu's back without issue, the page also features this photo of an adult using the Pokemon Air Pikachu as a cushion while playing on a Switch. The truth of the matter is that Pokemon Air is just a rubber blow-up Pikachu, and yes, I too would like to use it as a pillow while lounging on the floor of my expensive, brightly lit apartment.
For riding, though, might I recommend Arcanine
or perhaps Rapidash
? They're pretty cute, too! And you can actually ride them in the games. I can only hope the people at Pokemon Air are listening.