I can clone this Chansey:

Chansey (F) Lv. 5
Trait: Natural Cure
IVs: 30 HP / 27 Atk / 30 Def / 27 Spd / 20 SAtk / 25 SDef
(+Def, -Atk)
- Aromatherapy
- Toxic

As i still have it on GBA, i can teach seismic toss.

The only thing is that i need a few days to beat elite 4 and obtain national dex to use pal park.