well the one i heard the most is the glitch to clone Pokemon and their held item in Pokemon emerald.
AS is seen most commonly in males 30 years old and older
Insects are the most commonly seen animal in the desert.
penny
all the legendary pokemon, because come on have you seen them
decimals are most commonly seen in money.
Here is a complete list of glitches. From what I've seen, none of them seem game-ruining though, so that's good.
Law, followed by medicine.
i haven't found any and in many forums I've seen, most of them can't yet find a glitch for this game.
In the UK, the most commonly seen birds are probably Wrens. Hope this helps!
Green mainly.
the bottle nosed dolphin
Sadly, no but ive seen a few glitches