Every December on Tumblr, I try to do the PokeddeXY challenge where you basically draw a new Pokemon every day of the month based on given criteria. Though if I can't complete the whole challenge, I do draw this my Cacturne, Spikes, riding a Sharpedo. (They go under 'Favorite Dark Type' as I can't pick between the two)
This particular one was done in 2014. The original Tumblr post can be found here.
The light brushes that were used came from Obsidian Dawn