Typal decks are very well supported in Commander through utility artifacts like Herald's Horn and Vanquisher's Banner
Paras can be obtained from Genetic Apex: Pikachu pack in the Genetic Apex set
Whenever a land enters the battlefield under your control, if you control seven or more lands, exile Nissa, then return her to the battlefield transformed under her owner's control
Whenever a creature you control deals combat damage to a player, you make that many treasures
Most other decks have haste creatures, flash creatures, or large numbers of small creatures, and those arent what Tamiyo wants to play against
After testing with options like Malamar VMAX, Crobat VMAX and even Grimmsnarl VMAX, I felt the best version was the classic Dark Box with Darkness-type Tag Team Pokemon-GX