The soil shell that covered Torterra has hardened to they point of becoming a powerful metal, stronger than any rock or earth, thus gaining the Steel-typing, changing Torterra's weaknesses. Mega Torterra's shell is adorned with plantlife, and supply it with massive amounts of energy to move it's enormous body, but it also allows it to use all the powers of the earth by granting it the ability "Terra Firma". Mega Torterra is almost twice as big and over three times as heavy after undergoing Mega Evolution, granting it huge amount of power while furthering it's defensive prowess.
*"Terra Firma: Ground and Rock type moves used by this pokemon recieve a boost."(50%)
Torterra is such a sad case. Back in pokemon Pearl, I remember when I first evolved my Turtwig into a Grotle, and how exited I was when it evolved again into Torterra, back when I didn't go to any website to find out what pokemon were in-game. Torterra was a beast, destroying pretty much anything with it's Earthquake, while sporting the insanely powerful Leaf Storm and Wood Hammer to annihalate anyone who dares to wander in my way to becoming the champion of Sinnoh. But alas, as I moved on to new regions, and continued further and further, I found out that Torterra, while as badass as it was back in DPP, just couldn't compete in such a brutal metagame that hosts giant steel claded bugs, fire breathing dancing dragons, screaming pixies and super-sonic birds that dive bomb everywhere. It really pained me, and it didn't help that Torterra's Hidden Ability was wasted to Shell Armor. So to mitigate for that, I decided to give it a Mega that will strike fear to the hearts of all who see it. Mega Torterra is bulky, powerful and has a good defensive typing, becoming a stronger, faster Ferrothorn with reliable recovery.
P.S. Before anyone says anything about the typing being changed, there's Mega Charizard X, Mega Gyarados and Mega Altaria.
Hope you like it!
Pokemon © Pokémon Company/Nintendo
As I wrote down in the description, Mega Toreterra, as I made it, is a stronger, faster and bulkier alternative to Ferrothorn, one of the most played pokemon at the time, and unfortunately the fire weakness isn't ignored, but it does make it much more difficult for Fire types to switch in on Mega Torterra.
Turtwig did better than Torterra!
As far as to the design, even though Torterra is based on the world turtle, it is also based on a thyrephoran dinosaur, or an armored dinosaur. So I wanted my design to be more realted this side of Torterra. Although the idea of adding more landscapes to Torterra is cool, it is also highly impractical design wise, as it will have too details IMO. It will look better in some regards, but I think more of the competitive side of the pokemon, and what would fit him better in the current metagme, and I design the Mega after that. So beng a Grass/Steel type is the first thing that I thought about, with the design following it from there.
The typing that I gave it, Grass/Steel, may not fix Torterra's Fire weakness and it gives it a new weakness to Fighting, but it makes Torterra a much more solid switch-in to a multitude of threats, which are pretty much the things that Ferrothorn can switch in on, like Scizor, Azumarill, Garchomp, the Lati twins and many more, and unlike Ferrothorn, Mega Torterra can set up either Swords Dance or Rock Polish, depending on what you want to do, while threatening pokemon like Mega Venasaur with a powerful Iron Head/ Tail or Eartquake. the Steel type also makes Ice and Bug types much less threatning, even though they are much less common than more metagame dominating types, like Dragon, Fairy and Flying.
The ability of choice, "Terra Firma", is suitable to a more offensive pokemon, like Torterra, as it gives it's Steel type moves an insane amount of power while giving a boost to important coverege moves like Earthquake and Stone Edge, being able to predict a switch to something like Zapdos, Talonflame or Charizard, doing massive damage or even outright KOing them. Solid Rock/ Filter is a wonderful ability for sure, and it can make Torterra really bulky, and with a combination of a fairly reliable recovery in Synthesis, or even Leech Seed, Torterra would be hard to take down, that's for sure, but as I've said, Mega Torterra is and offensive Tank, with the ability to switch in and either set up, wall, stall or attack.
The combination of Mega Torterra's typing, ability and movepool make it an anti-metagame threat that can potentially run many sets with different purposes, like an entry hazard setter, a Tank, a Wall, a Wallbreaker, a Sweeper, whatever your heart desires Torterra can do. But you must always remember that Pokemon is a game that uses a team of 3 or 6, so if you want to use a pokemon to the full extent of it's potential, you should support it with it's other teammates.
For example: Mega Torterra is weak to Fire and Fighting? Azumarill and Air Balloon Heatran can take care of them. Mega Torterra is too slow for you taste? Use Trick Room Cresselia or a pokemon that can use Thunder Wave.