Latias Trio Raid Guide

Pros:

• Best non-shadow DPS option, hits extremely hard.

Cons:

• Low bulk, basically destroyed by Outrage
• Legendary Pokemon, can be expensive to raise

Pros:

• Extremely close to Rayquaza in performance. Potentially better given double-moveset
• Previously featured in its own community day, generally very obtainable

Cons:

• Basically deleted by Outrage
• Best moveset is event-exclusive

Shadow Salamence

The absolute top DPS option for this raid, can definitely help get ahead of the clock.

Pros:

• Great performance despite bad charged move due to high attack stat
• Dragon Claw being a 3-bar move allows for high average performance
• Resists Thunder

Cons:

• Deleted by Outrage
• Currently a very rare species

Pros:

• Good overall performance with potentially very high DPS given proper energy management.

Cons:

• Deleted by Outrage
• Legendary Pokemon, can be expensive to raise

Pros:

• Common species with great overall performance, available from day 1
• Featured in its own community day and special limited research, very common for most of the player-base

Cons:

• Deleted by Outrage

Shadow Dragonite

Another outstanding Shadow, Dragonite is a bit bulkier than Shadow Salamence, but has slightly lower DPS.

Pros:

• Good overall performance, especially against Thunder, which it triple-resists

Cons:

• Currently a rare species
• Deleted by Outrage

Pros:

• High overall performer
• Resists Thunder

Cons:

• Weak to Outrage
• Legendary Pokemon, can be expensive to raise

Pros:

• Good overall choice, but really shines Vs. Psychic due to double-resistance

Cons:

• Mythic Pokemon, cannot be traded. If you missed its latest release, you won't have one for this raid.
• Can be expensive to raise

Pros:

• Double-resists Dragon Type movesets, resists Psychic Type movesets
• Fairly common species, has been featured in several events and its own Community Day

Cons:

• Not viable for a trio outside of cloudy weather
• Frail, easily taken down by Thunder

Shadow Gardevoir

In its Shadow Forme, Gardevoir becomes a very reliable choice. With its great resistance set for this raid and solid DPS, Shadow Gardevoir is a generally worthwhile choice, though not generally a top choice.

Pros:

• Good DPS option for teams lacking power

Cons:

• Its DPS isn't as high as some may expect, which doesn't make it a very attractive option
• Weak to Psychic Type movesets and has no resistances

Pros:

• Good overall investment as it can pull double-duty as a Ghost or Fire Type moveset

Cons:

• Its DPS isn't as high as some may expect, which doesn't make it a very attractive option
• Currently a very rare species

Pros:

• Top TDO option overall. Resists Thunder, takes neutral damage from Outrage, and still sports high DPS. Can help keep from needing to relobby

Cons:

• Legendary Pokemon, can be expensive to raise

Pros:

• The "old reliable" Psychic and Ghost counter; one of the most common raid bosses historically 
• Double-resists Psychic type

Cons:

• Not a top counter outside of Psychic movesets

Shadow Tyranitar

Definitely a strong contender, Shadow Tyranitar is a very decent Pokemon when fighting Psychic Type movesets in particular.