Hey Sinzar, I'm ready to see a budget Echidna kill
S
Spark
As requested, here's a video of me doing Echidna ELT with all missions completed, no TMR, no event equipment, no limited units, and no rainbows (except the friend). Now, I used my own Tidus, but left the friend slot empty. You would instead leave a slot on your own team empty and bring a well geared dps friend instead (any high dps is fine, Tidus, Emperor, etc).
Video:
Team I used:
Snow -- With his innate draw attacks + provoke (Golem) he has 100% taunt. Give him Safety Bit for death and petrify immunity. All he does is soak the single target death/drain/charm with 100% taunt. Any unit with a way to get 100% multi-round taunt can do this role.
Veritas of the Earth -- Give him Genji Shield and a petrify resist accessory. VoE uses Guardian (aoe cover), then mitigation, then use fingersnap (Odin esper) to dispel the charm from Snow, then repeat the cycle. Any AoE physical cover tank can do this role, but if using someone else make sure they have a lot of earth resist (VoE absorbs earth, so he's best for this role).
Mystea -- She uses her aoe status immunity buff, then she casts Demonic Whisper (Lakshimi esper) on units who need some mana refill. Do not use her magic cover skill since it will block the physical cover from VoE from activating. Any unit that can give aoe status immunity can fill this role.
Garnet -- Any healer is fine here, I just chose Garnet because she has +esper damage to make the kill with an esper mission a little easier. The healing needed for this fight is minimal if done properly. Make sure your healer has raven cloak for 100% camoflauge and a way to cure petrify (craft Stona if they can't do it innately). Raven cloak prevents your healer from ever getting the mana drain during the ambush.
DPS friend -- Use whoever you want. Tidus is a good option because of his innate demon killer and 100% water imperil (if they leveled his limit break). Enhanced Emperor is another great option, but honestly any whaled out DPS will kill the boss in 10 turns or less by themselves.