Here is the google sheet for all command locations & every spirit combination:
https://docs.google.com/spreadsheets/d/1PYjCdblr2vUda8eQayPE73ZmRmY4BzP448__Fvq2AjM/edit?usp=sharing

If you just care about link basics, here's some (not all) of the Spirits so you can get each link and dual link on Sora & Riku:

SORA SINGE LINK
Meow Wounce - Meow Wow
Roll Call - Tama Sheep
Whirling Bronco - Yoggy Ram
Fly-By Knight - Komory Bat
Hammer Throw - Pricklemane
Flame Thrower - Hebby Repp
Decussation - Sir Kyroo
Poison Dash - Toximander
Water Blaster - Fin Fatale
Bubble Blaster - Tatsu Steed
Paw Groove - Necho Cat
Equestrian Raid - Thunderaffe
Swing Fling - Koomba Panda
Belly Raid - Iceguin Ace
Target Shot - KO Kabuto
Trap Shot - Staggerceps
Cure Sun - Wheeflower
Vacuum Ghost - Ghostabocky
Berserker Bronco - Zolephant
Lucky Dice - Juggle Pup
Fire Blaster - Tatsu Blaze
Poison Rain - Woeflower
Flame Raid - Tyranto Rex
Ice Raid - Skelterwild
Tail Groove - Ducky Goose
Aura Raid - Aura Lion
Unwind - Tubguin Ace

SORA DUAL LINK
Whomperstomper - Meow Wow + any Spirit
Comet - Komory Bat + Tama Sheep
Chaos Snake - Komory Bat + Fin Fatale
Trinity Limit - Komory Bat + Eaglider
Union Rush - Tama Sheep + Pricklemane
Prism Rain - Fin Fatale + Iceguin Ace

RIKU SINGLE LINKS
Shining Hammer - Meow Wow
Fire Raid - Yoggy Ram
Wavesurfer - Fin Fatale
Thunderstorm - Thunderaffe
Darkest Fears - Komory Bat

RIKU DUAL LINKS
Bladecharge - Meow Wow + Yoggy Ram
Rising Wing - Komory Bat + Meow Wow
Ghost Drive - Ghostbocky + any Spirit (except Lord Kyroo)