Increase the following stats by using GF Eden's Devour ability to eat the corresponding item:
Hp - Rinoa in Adel + 10 HP, Ruby Dragon + 10 HP Str - T-Rexaur + 1 Str Vit - Adamantoise + 1 Vit Mag - Behemoth + 1 Mag Spr - Malboro + 1 Spr Spd - Pu Pu + 1 Spd Note - If you eat a Cactuar your health is fully replenished.
-The following requires Doomtrain, Eden and Tonberry. You also need Doomtrains ability Forbid Med-RF, Edens ability GFAbl Med-RF, and Tonberrys Familiar and Call Shop abilities. You also must have been to all of Esthers Shops. Go to Esther Pet Shop in the Call Shop ability, then buy either Giant's Rings, Power Wrists, Force Armlets, or Hypno Crowns.
Refine them with GFAbl Med-RF into their next form:
10 Giant's Rings to 1 Gaea's Ring 10 Power Wrists to 1 Hyper Wrist 10 Force Armlets to 1 Magic Armlet 10 Hypno Crowns to 1 Royal Crown
Now use the Forbid Med-RF to turn them into status-ups:
1 Gaea's Ring to 1 HP Up 10 Hyper Wrists to 1 Str Up 10 Magic Armlets to 1 Spr Up 10 Royal Crowns to 1 Mag Up
It takes 150 000 000 gil just to get 100 of the status ups, each. Though this takes quite a while, it is shorter to do it this way then to eat monsters. You can also Refine Vit Ups by buying Vit-J Scrolls and using the GFAbl Med-RF to Refine 10 into 1 Orihalcan, then Refine 10 of those into 1 Adamantine, then use Forbid Med-RF to turn 5 of those into 1 Vit Up. You also can Refine Spd Ups by fighting plenty of Cactuars on Cactuar Island, and getting 100 Cactus Thorns then Refine them with GFAbl Med-RF to 1 Hundred Needles then Refine that using Forbid Med-RF, into 1 Spd Up.
-To get Squall's HP pretty high early, learn Siren's L-Mag-RF before you go to Timber. Get Squall to a high SeeD rank. Answer all the SeeD answers before going to Timber. Walk around the outside of Balamb until you get your pay, then enter Balamb and buy 10 Tents and refine them into 100 Curagas. learn Quezacolt's HP-J ability and equip the 100 Curagea to his HP-J.
-To get very strong early in the game, do the following. This can be done before or after your first trip to the Fire Cavern, but it will not be much help unless you have Ifrit, Str-J ability, and Siva's I Mag-RF ability. Either way, go down to the shoreline and repeatedly fight the Fastitocalon-Fs that appear. Each set of two will yield 6 AP; and it would help to have Ifrit learn Str+20% while doing this. Sometimes they will drop Fish Fins, and with the I Mag-RF ability, each of these can be refined into 20 Water spells. Once five Fish Fins are collected, they will be equal to 100 Water spells. Water junctions very well to any stat, and the best way to use the spell is to junction it all to Squall's strength. With 100 Water, and Str+20%, Squall will be doing a huge amount of damage.
-Use the following trick to acquire a 255 strength stat on Disc 1. It only works for one person(Squall recommended). Junction Shiva to a party member. She has the Str-J ability. Level up to level 30 or higher, then have Quezacotl learn the Card Mod ability. Have Ifirit learn all the strength boosting abilities (Str+20%, etc.) and Junction it to Squall or anyone else in your party. Win the Quistis card and the Zell card. Defeat Diablos by rubbing the magical lamp that Cid gave you. Have Diablos learn the Time Space magic refine ability. Using the Card Mod ability, turn the Quistis card into three Samantha Souls, and the Zell card into three Hyper Wrists. Use one Hyper Wrist on Ifrit so he can learn Str +60%. Turn the three Samantha Souls into Triples using the Time Space magic refine ability from Diablos. Give all these Triples to the desired party member. Junction Triple to Strength and the result is that your strength will skyrocket to at least 130+. To get to 255, use Ifirit's Str +20, 40, or 60% abilities. If it doesn't work, junction Diabos to the party member, since he has the Ability x3 ability, allowing you to junction all three Strength boosters to the desired character. You should now have acquired maximum strength while still on Disc 1.