So I SR for a good Mewtwo and I ended up getting a 4 IV Modest one. Unfortunately, I have X.

Is any Y anon willing to part with Mewtwonite Y?

I can offer:

Shiny Gabite
5/6 Modest Gastly
5/6 Brave Honedge
4/6 Adamant Charmander with DD/Outrage
2-3/6 Modest DW Abra
2-3/6 Jolly/Adamant DW Dratini
Mewtwonite X
Manectite