Lets create together the master piece 9th gen

1-3 Grass starter - deer grass/fairy on final stage
4-6 Fire starter - snake pure fire and a zodiac animal
7-9 Water starter - a tough hipo, water/ground on final form
10-13 regional bug - ant with split evo to soldier bug/fighting, and Queen bug/fairy
14-16 regional bird - normal/flying parrot line
17-18 regional rodent - normal/steel hedgehog

Now you continue, anon...