|Evolves from||Slowbro (Slowbronite)|
Mega Slowbro is a Water/Psychic-type Mega Pokémon that Mega Evolves from Slowbro when holding a Slowbronite.
When Slowbro Mega Evolves into Mega Slowbro, it becomes engulfed by Shellder to the point where only its head, arms and tail are visible. Shellder now has an opening at its tip, allowing the tail of Slowbro to stick out, which it balances on due to its legs being engulfed. The spikes on the Shellder are now reduced to four on the bottom section of its body, with the dark spots only visible on its middle section.
Mega Slowbro moves by bouncing, using its tail as a spring.
Mega Slowbro's energy has gathered into Shellder, which has increased its hardness. This allows it to act as an armor so hard that nothing can scratch it.