Yep, my favorite GS is at the very bottom: Regirock. 
Although tbf, I can understand why the Regis are low, since unlike the Eeveelutions, Rayquaza, Pikachu, Charizard, etc. they’re not the most popular Pokémon. But I personally like the pose Regirock has in the GS artwork, making full use of the extended artwork beyond the artwork borders to give the artwork depth. 
Not too surprised to see Rayquaza (my 2nd place) at the very top.
Greetz,
Quuador