Almost perfect poke, h.a. Took like 1000h+ to get. And ruined just for that SPD iv. The coin could be used to allow you move one IV to another. Like move that 25 IV of attack to SPD. I dont see the problem. But just move existent ivs. You if you got like less than 20IVs in each stat, the coin would not he useful.
If i wanted more speed, i would need another roll to change the 28 DEF for speed.
I have to look again for another eevee h.a right nature and good stat its because one is crappy? The coin would be great in this case, and the same for others.