As Ive mentioned several times before, Team Up saw the introduction of Tag Team Pokmon-GX, putting two or more Pokmon on one card, upping their HP, upping their power, and making them surrender three Prize Cards to balance them out
No technical skills are required
Sven Stolz Thoughtseize is the strongest discard and interaction spell the format offers
This card can be obtained via the Celebrations Ultra Premium Collection, and as those wont likely be reprinted, this card should hold up value overtime (despite the current downward trend in value)
most notably, while Jin-Gitaxias gives you plenty of cards, she herself does not alter your own hand size, which means you would still have to discard down to seven unless you have a card that says otherwise
Also, a shoutout to others in this ilk like Bloodgift Demon