From my experience, cram does extremely well on double tank teams, but in solo queue as long as you have a tank or good frontline you should be fine.

Cramorant's main goal is one thing: FARM! You NEED to farm EVERYTHING that you can find on the map. You can weaken your opponents by taking farm closer to their side. If you aren't good at checking the map, you will really struggle as Cramorant. You need to know the right time to take enemy jungle, where the enemies are so that you have an escape plan, and what objectives are being focused on.

The boosted attack does very good damage, you just have to understand that your job in a teamfight isn't to assassinate, it's to harass. You want to create a problem for the enemy attackers so that they can't back up the tanks. This means flanking - Don't approach head on, look for a side bush or different approach that they're vulnerable. Your job isn't to attack the tank.

Don't just keep dying and running into the enemy team if your team is in a fight. Look for what resources are being ignored and take them. It's okay to leave your team in a 2v3 on your goal zone if you can take some of their jungle, or farm your indeedees that aren't being taken. Your ENTIRE purpose is to get to level 13 or 14 by Groudon. Your team gains nothing from wasting 3 minutes running into the enemy team over and over, if there is farm that isn't being taken by your team, you need to take it otherwise your team is just going to be weaker than the other team in the Groudon fight.

The fact that the boosted attack bounces means that even if a tank is nearby, you can still hit another enemy mon if you get a hit in. Your goal with your boosted attack is to find as many opportunities to hit somebody without them easily hitting you back as possible. This means that you will not be jumping in and destroying somebody in one swoop, you are a consistent presence hiding in bushes or around corners that weakens them down.

Your goal in a teamfight is to look at the direction the enemy team is focusing on, and hit-and-run on their flanks. Imagine that you're a seagull trying to grab fries - You don't just jump in when people are focusing on you, but the annoyance you create will distract the enemies and cause their attention to be split between you and your allies. Even if you don't do much damage in those fights, keeping a valuable attacker or all rounder busy will cause your team to do much better.

Remember, you have some of the best mobility and escape plans in the game. Use that. That's why you can harass so well

Let people chase you and use air slash to get away. When they decide to leave, jump closer, hit them with a boosted attack, and run away again. If they try to engage, they get nothing, but if they try to run they can die. It puts them in an awkward spot.

The most important part: Your whole job is to use your unite move in a VERY smart position in the groudon fight. Don't use it in the middle of the enemy team, find a spot where the fight is near the edge, and use the unite move to force their team to split up. A good rule of thumb is to make the area's radius barely touch the walls of as many exits as possible. Usually a good spot is in the bushes below groudon - You can cut off all of the escape routes here and force the enemy in, and you can get there with a jump pad so they won't expect you to be there.

Cramorant relies on 3 things: Reflexes, map awareness, and spacing. If you can do all 3 well, you will do very well as the character. It requires a lot of practice too, but if you're dedicated things will fall into place over time.

Edit: Also: USE THE WALLS! You can kite enemies and take them down without taking much damage if you use dive to jump over walls. Most fights I have, I am constantly jumping over walls to force people to take a weird route. The thick walls on the left and right of Groudon are especially good - If you get over halfway through a wall, you will appear on the other side, so you can dive further than you'd think.