Vanguard

Vanguard boosts player damage by 10%.
With each pal having vanguard the players gets a 50% damage boost.

Ragnahawk

Ragnahawk has a Partner Skill that changes the players attack to fire and applies an attack damage bonus that scales with Star Rank.

Using grass skills creates a vine effect that doubles fire damage.

Frostallion

Frostallion has a Partner Skill that changes the players attack to ice and applies an attack damage bonus that scales with Star Rank. This Bonus also increases with other +attack bonuses, making it very strong to combo.

Gobfin

Gobfin has a Partner Skill that applies an attack damage bonus to the player that scales with Star Rank. Adding 4 of these with vanguard to the party greatly increases player damage.

Catching 400+ Gobfin:

Fast & Expensive:

Use ~600 Legendary Spheres and a Homing Sphere Launcher, takes ~15-20min.
Keep in mind that Legendary Spheres cost 20 ore while Hypers only cost 6.

Budget:

Use ~400 Hyper Spheres and a Homing Sphere Launcher after softening them up with Mossanda, takes ~30-40min. Use more than one Mossanda for the CD or drop the pal on the ground to reset the CD (v0.1.5.1).

Buffs

Attack Pendant +2: +15% attack each
Can wear two for 30% buff.

Mozzarina Cheeseburger: +20% attack each

Materials:
2 Mozzarina Meat
1 Flour
2 Tomato
2 Milk

Using no pals and a regular rocket launcher:

Using a normal team:

Four Rank 4 Gobfin, Ragnahawk, Assault Rifle:

Four Rank 4 Gobfin, Ragnahawk, Rocket Launcher:

Four Rank 4 Gobfin, Frostallion, Assault Rifle:

Four Rank 4 Gobfin, Frostallion, Rocket Launcher:

Four Rank 4 Gobfin, Frostallion:

Ice + Rocket Glitch for fast farming [v0.1.5.1]: