What exactly are marks?

Question

I don’t really get it, how do you see if a Pokémon has a mark, and do they have any effect on the Pokémon?

Answer 1

Marks are essentially just Ribbons except that a Pokémon can only have one Mark, at it is obtained when the Pokémon is caught. Also, Pokémon have a 5% chance to have a mark. You are that the Pokémon has a mark in the Summary Page. Then Marks have no effect on Pokemon except the mark gives it a title when it is sent out to battle.
Source: https://m.bulbapedia.bulbagarden.net/wiki/Mark

Comments

Additionally, only Pokémon found in the wild can have a mark. Pokémon from eggs and raid dens cannot.

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True.  I totally forgot about  that.

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Thanks! If a wild Pokémon has a mark, does it say the title, or do you have to catch it to know?

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You have to "assign" it the mark. Go to the summary and select it. Next time you throw that 'mons ball out, it'll say its title.