Petit Dragon + Turu-Purun → Spike Seadra

Petit Dragon + Guardian of the Sea → Spike Seadra

Petit Dragon + Aqua Snake → Spike Seadra

Petit Dragon + 30,000-Year White Turtle → Spike Seadra

Petit Dragon + Kappa Avenger → Spike Seadra

Petit Dragon + Kanikabuto → Spike Seadra

Petit Dragon + Zarigun → Spike Seadra

Petit Dragon + Destroyer Golem → Stone D.

Petit Dragon + Barrel Rock → Stone D.

Petit Dragon + Minomushi Warrior → Stone D.

Petit Dragon + Stone Ghost → Stone D.

Petit Dragon + Kaminari Attack → Twin-headed Thunder Dragon