RIVAL DATA (will choose according to triangle)
Charmander > Chespin > Totodile > Tepig > Torchic > Machop > Trapinch > Chimchar > Charmander
OTHER RIVAL TEAM MEMBERS FOR LATER:
Petilil (unless Chespin)
Duskull (unless Tepig)
Dratini (unless Charmander)
Feebas (unless Totodile)
Gulpin (unless Trapinch, Torchic)
Riolu (unless Chimchar, Machop)

PLAYER CHOOSES A STARTER!
level 5 (Leve Cap starts @ 12)
Charmander
Totodile
Torchic
Machop
Chimchar
Trapinch
Tepig
Chespin

(do not make a 1 pokemon team for rival fight #1, that's just dumb and I made them already)

(potential pokemon before rival fight #1 (ignore the numbers, they're there for other data reasons)
1 Rattata
2 Pidgey
3 Sentret
1 Hoothoot
2 Spinarak
3 Poochyena
1 Zigzagoon
2 Wurmple
3 Bidoof
1 Purrloin
2 Caterpie
3 Kricketot
1 Patrat
2 Lillipup
3 Weedle

1 Ekans
2 Sandshrew
3 Nidoran M
1 Jigglypuff
2 Zubat
3 Ralts
1 Wingull
2 Surskit
3 Nincada
1 Pansage
2 Pidove
3 Sewaddle
1 Seel
2 Hoppip
3 Slugma

Azurill
Skitty
Budew
Tympole
Natu

-

Rival Fight
lv 18 Feebas/Petilil
lv 18 Petilil/Gulpin
lv 20 (starter)
(When you make the teams, don't make a million teams in Showdown.  Just make one team that has Feebas, Petilil, Gulpin, and all the starters.  If you use text, you can put more than 6 pokemon on a team and just manually remove them later on another team.  What I do is have a massive template for a fight like this, then have the actual "fight" team where I copy and paste what's needed into there.  If that makes sense.)

-

Next pokemon available before next rival fight (in addition to all those others):

Togepi, Riolu, Zorua, or Eevee

1 Zubat
2 Diglett
1 Geodude
2 Onix
1 Makuhita
2 Bronzor
1 Shuppet
2 Gastly

1 Squirtle
2 Tyrogue
1 Smoochum
2 Bonsly
1 Treecko
2 Shinx
1 Pichu
2 Venipede
1 Bulbasaur
2 Mudkip

-

RIVAL BATTLE #3: (5 points)
lv 29 Dratini/Duskull
lv 31 Duskull/Petillil
lv 31 Petillil/Swalot
lv 32 Swalot/Milotic
lv 33 (starter)

-

NEXT GROUP:
Dratini, Lapras, Petillil, or Feebas

Goldeen
Tentacool
Poliwag
Qwilfish
Basculin

Quagsire
Chinchou
Phione

Koffing
Croagunk
Shuckle
Joltik
Snorunt

1 Venonat
2 Gloom
1 Kadabra
2 Minun
1 Blitzle
2 Deerling
1 Ponyta
2 Mareep
1 Farfetch'd
2 Unown

ONE Fossil mon (can be any fossil mon though)

Groudon OR Mew

Entei

One of:
Zapdos
Uxie
Celebi
Zygarde

Pupitar
Druddigon
Rotom
Meloetta
Sneasel

-

RIVAL BATTLE #4: (6 points)
lv 58 Dragonair/Dusclops
lv 59 Dusclops/Swalot
lv 59 Swalot/Lucario
lv 60 Lucario/Lilligant
lv 61 Lilligant/Milotic
lv 63 (starter)

-

next group:

ONE OF THE FOLLOWING:
Giratina
Zekrom
Rayquaza
Reshiram
Genesect
Dialga

-

RIVAL BATTLE #5: (6 points)
lv 79 Swalot/Dusknoir
lv 80 Dusknoir/Dragonite
lv 81 Dragonite/Lucario
lv 81 Lucario/Lilligant
lv 82 Lilligant/Milotic
lv 83 (starter)

-

That's it.  Good luck!  If you have questions let me know.