Digimon game released on numerous platforms in 2005. It was released on the PS2, Xbox and, in Japan and the US, the GameCube. Differs significantly from its predecessors by being closer to an action RPG than a typical Mons game.
This game contains examples of the following tropes:
Mecha Rogue Delta is fought as the boss of Goblin Fortress, three are fought for the boss fight of Vine Tunnel, and in the final section of the game they're essentially normal enemies.
Difficulty Spike: The difference between difficulties is shocking the first time you experience them, specially when you've just beaten Normal Mode and went to Hard Mode, where even Goblimons have craploads of hp, are much stronger and much more durable.
Guide Dang It: One could go through the entire game without knowing that it's possible to Digivolve.
Each character has their own signature weapon that is obtained by beating all the bosses in one sitting, then heading back to the first area and fighting a rare enemy. Most of the strategy guides for this game don't even know this.
The sponge-like walls in some areas of the game, which require you to use a specific Elemental Magic/Chip to break them. Some of these areas actually have other ways around them, but some doesn't, so if your Digimon doesn't have any chip or magic that's capable of breaking them... then you're pretty much stuck.
King Mook: Rarely, a normal enemy digimon will show itself with a blue crown in its lifebar. When it happens, that digimon becomes way more resistant and powerful, and generally drops good items. However, even more rarely, a digimon will show itself with a gold crown, where it in turn becomes a Boss in Mook Clothing.
Life Drain / Mana Drain: It's possible to equip chips with these effects to your weapons, provided they have mods to do it.
Limited Loadout: Each character can set up to three equipped weapons at a time. If you want to use that shiny new sword you picked up from a defeated enemy, you'll have to go back to base and equip it at the Digi Lab. Justified in that this is the Digital World and the Digimon probably have to load the weapon data.
Magic Knight / Red Mage: Every Digimon has the potential to be either, as they have acess to melee attacks, damaging magic, healing magic and supporting magic. However, they're generally better at one than the other, or in the case of the mage digimons, have acess to more magics of one type than the other.