Skate 3

This is the first thing you'll do in the DLC. If you don't know how this works, you face off against 5 other AI skaters at the same time in a three round contest. After each round you get 5 points for first, 4 points for second all the way down to 0 points for finishing last. The winner is the skater with the most points at the end, meaning that you don't need to win every round for this trophy. The rounds are broken down as followed:

Round 1: Grinds

Self-explanatory. The only way to earn points is by grinding. You have 1:30 to get as many points as possible. The way I do this is just go straight and grind the rail and the ledge, then at the bottom I grind the long crescent. Just make sure to trick onto and off everything and you should get a good amount of points. Then teleport back to the start then repeat until the time is up. Since everyone is doing this at the same time, be careful of collisions with other skaters, especially at the start. Try to get at least 6000 points. It's random how well everyone else performs but 6000 seems to be enough to win most of the time. It's possible to be beaten and it's also possible to win with less.

Round 2: Best Trick

All you need to do on this one is do a single trick that beats everyone else's. You have as many attempts you can fit into 1:30. In addition you have no multipliers to help you out but luckily it's an even slate. The way I did it was darkflip (holding down while doing a trick) while spinning onto the rail directly in front then flipping off, this gave a good score. Another way I managed high scores is on the ledge in front of the rail, where I did a little tweak (move in any direction) before landing and tricking off. If you are good at landing into manuals, this will basically guarantee victory if you do it well enough. Try to get over 800, as this seems to be the max I have seen the AI go.

Round 3: Jam

This is nearly identical to round 1, except anything goes. Still, I recommend going for a similar approach to the first round, as grinds are usually the best way to go in flat competitions but you can also do random tricks inbetween to boost your score and multiplier. Again, 6000 is a suitable target to aim for.

Notes:

• No AI skaters are consistent over replays of the contest or more importantly over different rounds. In 2 attempts winning all rounds, the next closest person was 8. You can therefore safely finish second or higher each round, unless the same person wins a round more than once. If you win at least one it'll be very hard to lose.
• You can't restart or you'll start at round 1 again. Therefore only restart if you’re doing poorly in the grind round. As implied above, it is not the end of the world if you don't win a round.
• I'm not entirely sure how the AI works. They may be designed to the players skill so the better you do the better they do to compete. Like I've said before though, it seems to be random because as I've had times I've done well and they come close and times when they do really badly despite me doing well.