To make the most of your AT&T signal you can use a signal booster
Three retailer promos, Primarina, Zarude, and Armarouge, carry the 30th Celebration Whats Your Favorite stamp and are gift with purchase at $15 or more on Pokmon TCG product, with Primarina at Hot Topic, Barnes & Noble, and BoxLunch, Zarude at GameStop, and Armarouge at Best Buy
Here's a fun detail: This card has the Flashback mechanic, because after all, we see this scene in a flashback
This stadium card solves problem number one, allowing you to find your items (which act like basic Pokmon in this context) without needing you to draw them manually
As for the effect of excluding yourself in the second half, I would like to use it with 2 Xyz materials, and place Sprind the Irondash Dragonon GY as a priority, aiming to develop the End Phase
For the Celestial Guardians set, its none other than the two mascot Pokmon of Alola, Solgaleo and Lunala