Simplify the following text for a Grade 7 native English-speaking person.
Original: After an encounter with MissingNo . , the quantity of the sixth item in the player 's item menu is increased by 128 , and the game 's Hall of Fame PokÃ mon gallery becomes permanently glitched .
Simplified: After encountering the MissingNo . , the sixth item in the player 's item menu will be copied to 128 , and the game 's `` Hall of Fame '' gallery will become scrambled forever .