Are there any cheats in legitimate games?

Question

If you had a completely legit non-emulated game, are there any cheats/glitches in-game?

Comments

There are definitely glitches, but with cheats, it really depends on what you define a cheat as.

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I maybe press a series of buttons, then "magically" get an item, or a place appears

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Then the answer is no. No such thing exists outside of emulators and other hacked copies of the game.

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how about glitches that never change, such as if you do...this happens, or something?

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Well yes, glitches can have permanent effects, but glitches aren't cheats.

Answer 1

There are a number of glitches, not many being to your benefit though, other than the Pokemon cloning glitch. If you want to see all glitches, look here.
As for cheats, there is a device called an Action Replay Powersave, which can be used to make any changes to the game's save file, allowing you to do a variety of things such as turn Pokemon shiny and get 999 of every item, etc.
There are no ''in-game cheats'' though.