ASTRO BOT

First, you'll need to unlock the Royal Roller — a Special Bot you can find in the stage Downsize Surprise in the Tentacle Nebula. He's a green little guy, and if you're in the know, you'll recognize that he's a reference to The Prince of All Cosmos from the Katamari Damacy series.

Once you've found this bot, you'll need to unlock his special item via a Gatcha Lab capsule — a big sticky Katamari ball.

Next, you just need to slap the Royal Roller while he's standing around in Crash Site (he's standing pretty close to the Gatcha Lab). This will cause the Prince to roll the Katamari ball, and all you have to do to unlock the trophy is stand in the ball's path as he rolls around. Astro Bot will get stuck to the ball, much like everything else in the known universe, and you'll unlock the Royally Stuck trophy.

As I advise in my Astro Bot platinum trophy tips, these sort of trophy conditions are best not forced — it'll all unlock pretty seamlessly if you just play the game first. So, if you haven't found the Royal Roller or his Katamari, then I recommend just waiting until after you beat the main story to get this one!