Strange cards like Dudunsparce have found their way into some decks as odd consistency pieces, while Pidgeot ex allows places to add any card from their deck to their hand once per turn
To give examples of what that means, here are some instances of Nintendo reprinting old cards with rebalances or updates to either buff them to be usable with modern cards, or nerf them to stop them from being completely broken: Spoiler : As you can imagine, there are lot of Pokemon cards, and updating them all to comply with modern standards is quite the task
We might need to revisit our deck that we created but never managed to do anything with them
Q6479 May
Above is shown an example of an Extra Link, having Link Spider point to Firewall Dragon, which points to Honeybot, which points to another Firewall Dragon, now allowing you to Link Summon another Link Spider that point down towards Firewall Dragon, making an Extra Link