Via Infintro

[Mo-Nercy]

I went down the Via Infinito with Yuna and Paine in Mascot and Rikku in Berserker (training for Mascot). I beat the bosses at levels 20 and 40 with that combination just by attacking. At 60 and 80, I used Cat Nip + Gunner + Highroad Winds + Speed Bracer combo but in between 40-60 and 60-80, I used the dual Mascot and Berserker combo (just so I could get some AP, still hadn't learnt Ribbon at this stage) That combination was good enough to last me till level 80 at which point I decided to go with a Gunner + Cat Nip the rest of the way.

Vs. Paragon, I had a single Gunner with Cat Nip and two Mascots. Took like two turns because I wasn't using Highroad Winds anymore, but Higher Power on all three girls, so everyone had about 17K HP (Gunner of course was hovering around 600 HP)

Vs. Trema. I killed my Gunner, then used a Stamina Tonic and a Megalixer straight after to get my HP up to 34K before Phoenix Downing my Gunner and letting loose. My Gunner died to every Meteor, Ultima etc. but I had plenty of Phoenix Downs and my Mascots tanked everything (I mean, like, 34000 HP). I even used X-Potions every turn to ensure victory.

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This probably won't help you though. . It's your first play so you probably don't have Mascot or Higher Power.

BUT, you should have the Highroad Winds GG and a Speed Bracer, which will take away a lot of the risk of your Gunner dying.

The level 60 and 80 bosses become easier if they oversoul (apparently, that's how you're "supposed" to beat them) so if you find yourself having trouble, you can reset until they oversoul.