There is no such thing as a paradox in coding.
Although Action Replay can be helpful, it is also known to freeze the game occasionally and to cause minor problems. Codes that simply allow users to change Pokémon, levels, or stats tend to be harmless, however, others like walk through walls or codes rewriting major events in the storyline may result in minor game glitches or corrupt the entire save file.
If one uses too many codes at once, the probability of freezing rises. If one encounters freezing, it is recommended to disable recently-added codes before starting the game up again. Having less codes enabled decreases the likelihood of
"paradoxes" created in the coding, thus decreasing chances of freezing. When the user turns the game back on, the trigger which prepares the execution of the code may not cause the game to freeze, and if successful, the user will be able to resume play. If the user has used an Action Replay and wishes to play their game without the use of codes or to fix problems and glitches caused by the codes, they can restart their game file.
Several examples of Action Replay codes include walk through walls, [[event]] codes, and [[Shiny Pokémon]] codes.