I kept seeing people waiting for Trading feature to move their Immersive/Crown card from 2nd account to main one. And they're usually highly upvoted with many people agreeing on it.

Here's a harsh truth: It's not going to be possible.

The bare minimum restrictions just by using common-sense logic are:

1. Same Rarity

If they allow trading your 27 Ponyta with EX, that's just going to create a real-money market. Also the trailer shows same-rarity trading.

2. Dupes Only (3 or more)

Allowing to trade only copy will make it extremely easy to reroll alt account. For example you have 2 Immersive Mewtwo, you reroll new account until you get Immersive Pikachu and trade it.

If they allow you to trade your only copy, the collection tracker & quest will be messed up too.

This is also the same restriction for Flair.

3. Old Sets Only

There's a reason trading will be added on end of January (the same time as the next expansion). Because they will only allow us to trade previous sets.

It's useless to add Trading now when there's no previous set.

They want to incentivize people to pay for the shiny new expansion. But still help newer players to catch up by getting the playable cards from past expansion.

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If you don't think those 3 restrictions will be there, you are highly delusional.

There's a great chance that Immersive and Crown Rare is not tradable too based on Wonder Pick limitation. Or even only allowing Diamond cards since the star cards are just cosmetic that doesn't affect gameplay.