I was able to finally get the design for my Rock-type Eeveelution completed!
I present to you Quartzeon!
It's a bit of a unique evolution for Eevee in that it needs to be exposed to electromagnetic energy while holding one of the 18 different elemental Attack Gems and leveling up. It does not matter which type of stone it is holding.
The best part about the Quartzeon is that each individual Quartzeon's colors will change based upon the type of elemental stone it was holding at the time of its evolution.
For the sake of simplicity, I decided to 'default' to a design that would be based more off a 'Normal Gem', which results in the myriad rainbow colors you see here.
Any other gem used will not result in this rainbowed patterning. Also, due to the nature of the influence that each elemental gem can have on an individual Quartzeon, there is no shiny variant. All Quartzeon are, in a manner of speaking, 'shiny', because of the gemstones used to evolve them.
A Quartzeon is capable of extending, retracting, or shedding its crystals as it sees fit. It is also capable of accelerating their growth to further bolster their defenses.
This is a semi-open species; contact me if you want to make one of your own. Also, be sure to credit me too.
Now for Quartzeon's raw data:
Name: Quartzeon
Classification: Gemstone Pokémon
Type: Rock
Ability: Solid Rock [Reduces Super Effective damage by 25%] Hidden Ability: Sand Force [Increases power of Rock, Ground, and Steel-type moves by 33% in a SANDSTORM]
Base Stats: HP: 130 Attack: 65 Defense: 95 Sp. Attack: 65 Sp. Defense: 110 Speed: 60 Base Stat Total: 525
Means of Evolution: Level up while holding any elemental damage boosting gem in a specific location with concentrated electrical or magnetic activity, similar to Magnezone and Probopass.