Pokemon: DNA Splicers Fusion

[Pokemon + Pokemon + Journey Story + Chien-Pao from the start + DNA Splicers + Challenging Stronger Opponents + No System + No Legendary Pokemon]

What if DNA Splicers could be used on any two Pokemon?

Fuse a Dark type Pokemon with Shedinja:

The most broken Pokemon: a Pokemon with the Dark and Ghost-type Wonder Guard ability, weak only to Fairy-type moves.

Fuse Slaking with a Marill that has the Huge Power ability:

The strongest Pokemon: Slaking with the Huge Power ability and a base Attack stat of 160.

Invincible below Legendary Pokemon, and able to trade one for one above them.

Shedinja plus an Aron with the Sturdy ability:

The toughest Pokemon: a 1-HP Shedinja with the Sturdy ability.

The Sturdy ability can activate without limit.

(Readers can leave comments with their wildest Pokemon fusion ideas. Fun designs may appear in the novel.)

The author has over 10 years of experience playing Pokemon games and has a solid grasp of Pokemon lore, so there won't be many plot holes.

Fusion rules:

1. Retain the first Pokemon's base stats.

2. Replace its ability with the second Pokemon's ability.

3. Have access to both Pokemon's move pools.

4. After fusion, the Pokemon's form is primarily based on the first Pokemon, with elements of the second.