Jirachi GX ~ HA, no.
PsyPoke TTGX ~ Cool, but limited versatility.
Weavile GX ~ Im afraid of this. The ability is great, but that GX attack is actually crazy. Now, I know that it's a Stage 1, but remember Slim Shady TTGX was just leaked a few days ago with the ability to copy attacks from GX/EX Pokemon. With all that said, I want to put into perspective of what I'm seeing:
That GX attack, for 1C, is now on a basic with 260~270HP, and will have a full bench possibly T1 or T2 that includes possibly other TTGX, GX/EX, or non-GX/EX basic Pokemon. That means you not only save the use of Supporters in your deck, it also makes your board state so aggressive and intimidating early game, forcing your opponent to follow your pace. On top of that, it can be splashable for decks in the next format if there won't be any reprints of Nest or Ultra Ball!
In Dark decks, it's very formidable (especially in Expanded after the next rotation), but with Mew&Mewtwo TTGX...this scares me. Why is no one in this comment thread not seeing this yet???