I just felt like giving my suggestions (and remember these are just some ideas):

Intermediate Trainers:
-Evolved Starters 1 (E.g. Charizard, Blastoise, and Venusaur)
-Evolved Starters 2
-Evolved Starters 3
-Evolved Starters 4
-Evolved Starters 5

Professional Trainers:
-Fighter Trainer (Machamp, Conkeldurr, Gallade, Lucario, Primape, and Hariyama)(or if you have better ideas for trainer reply)-(:REPLY:)

-Stell Trainer (Aggron, Matagross, Heatran, Bisharp, Steelix, Durant)(:REPLY:)

-Legendary Trainer(or if you have a better name) (Jirachi, Deoxys, Phione, and Manaphy)(:REPLY:)

V.I.P. Trainers:
-Officer Jenny

Legendaries:
-Entei, Suicune, and Raikou (Try to come up with a name for these, such as Zapmolcuno for Zapdos, Moltres, and Articuno)

-Palkia, Dialga, and Garatina (Trio)
-Lugia and Ho-oh (Duo)
-Mew and Mewtwo
-Latias and Latios
-Darkrai and Cresselia
-Thunderus, Tornadus, and Landorus
-Groudon, Kyogre, and Rayquaza
-Uxie, Mesprit, and Azelf
-Celebi and ShadowCelebi
-Regirock, Regice, Registeel, and Regigigas (Team)
-Reshiram, Zekrom, and Kyurem

And if you have other ideas, you can reply to add onto or edit this list.

this is a wonderfull awesome fantastic .... v.v.good idea 100000000000000000/10. sorry infinity out of 1

Nice idea man. Hopefully this gets added. 9/10

I don't see the point tbh, no-one cares much about the npc trainers except the mysterious trainer.