Advice on making a progression meta-game for my daughter

Howdy,

I'm an old man that knows very little about pokemon as a franchise or the game itself (I've played minuscule amounts of magic/hearthstone/gwent so I'm not totally hopeless, just no pokemon). My young daughter, however, is enthralled and her birthday is coming up--I'd like some advice from y'all on how to best engage her.

long story, short, I want to try to deliver her birthday/christmas presents in a memorable way while also guiding her (and I suppose my) play experience in an enjoyable and sustainable way. What I'm thinking about doing is setting up gym battles for her where she has to beat me in order to win pre-constructed decks.

For example: she has the 2024 battle academy and has played those three decks to death so I've picked up the 2022 battle academy so we can go 3 decks vs 3 decks in something akin to a gym battle, choosing a pokemon (deck) for each stage. I've already printed off several pokeball deck cases to store everything and let her throw out a deck of use (these, for reference). Once she eventually wins 2/3 in a sitting I hand her those three decks, and she wins the basic gym badge which allows her to contend for higher level decks.

I've already also purchased off of e-bay a few cheap additional level 1 decks (blastoise, venusaur, rayquaza, and noivern vbattle decks) which can serve as "wild" pokemon battles where she can somehow use her team of 6 from the battle academies to fight me and capture them. Ultimately the goal is to move her up to level 2 decks through "wild" encounters by letting her win some combination of 3 decks from quaquaval/mewoscarada + inteleon/urshifu + marnie/steven decks before facing the other side of those pairs in another gym battle. Once she wins that badge I start trying to figure out level 3 decks that would be suitable etc etc (i.e. league battle decks, hopefully for christmas).

I've got some questions on how to pull this off though:

1. How would you recommend running the "wild" encounters? The goal is to get higher tier decks into her hands to prepare for the "gym" battles, but there needs to be some mechanism for her to be able to use a combination of trash tier decks to beat a single better deck to start moving up the power curve.

2. What additional flair can I add to the "gym" battles? Right now I'm just imagining that I'll choose a deck, call it out, then let her choose a deck to counter it 3x over. Anything additional I could add to make it more fun?

3. What should the gym badges look like? I can 3d print basically anything.

4. any recommended decks I should add to this process (I already have all the explicitly named decks above in hand, for reference).

5. The biggest issue where I need your help the most: what catchphrases or other framing devices can I cringily call out to her relentlessly throughout this process?

Thanks!