Steelix vs Shiny Gyarados

1. Gyarados

Max CP: 3281

Best Moveset: Dragon Tail/Hydro Pump

The fifth strongest Pokemon in Pokemon Go,Gyarados is a fearsome attacker that can ravage the lower levels of most Pokemon gyms with ease. Unfortunately, it's also a major pain to get a Gyarados, as players typically need to capture 126 Magikarp to get enough candy to get a single Gyarados. 

• Hydro Pump is a high performing charge move that is incredibly effective offensively.  Gyarados has the strongest Hydro Pump in the game, boasting a enormous 237 attack stat.
• Dragon Breath (Legacy) and Bite perform similarly and have better respective match ups. Both moves are great for players who like to dodge quick and charge moves.
• Dragon Tail will out perform other offensive quick moves in most situations, having the highest damage output with decent cool down and energy gain.
• Outrage deals less overall damage than Hydro Pump but still packs a heavy punch and is great for the Dragonite match-up 
• Dragon Pulse (Legacy)  is a worse Outrage.
• Twister (Legacy) is overwhelmingly bad now that Hydro Pump got buffed.  Its short dodge window doesn't compensate enough for its low damage. (there is a bug with how the true DPS displays, we are working on fixing it soon).

2. Steelix

Max CP: 2439

Best Moveset: Iron Tail/Earthquake

Steelix has dual typing, which makes it take reduced damage from most high ranked attackers. Its defense is also the second highest in game defense stat (right after Shuckle). Not too bad Attack and Stamina make Steelix quite useful Pokémon in the current meta.It’s good for attacking gyms, both for training purposes or taking it down, but it also makes you reconsider what you are going to use to beat it in higher level Gyms.

Quick moves

• Dragon Tail is good for taking down Dragonite, but that’s it.
• Iron Tail has same speed as Dragon Tail (1.1 sec) and same Power (15) and even though it gains less energy it does Stab damage what makes it do higher DPS overall (17.1).

Charged moves

• Crunch is worst Charged move for steelix with lowest DPS (21.9).
• Earthquake has higher DPS (41.7) but takes 100 energy to cast an is very slow (3.6 sec).
• Heavy Slam has same DPS as Earthquake but it takes half energy to cast (50) and is a lot faster (2.1 sec).

The video shown steelix cp1841 vs gyarados cp2117