>>48570846I keep my event Arceus in my gen 4 games so I can do the Sinjoh ruins event and get a level 1 palkia, dialga, or giratina for my team when I play HGSS. They're very strong but not completely game breaking if you use them as part of a 6 mon team. Your starter and any other early pokemon you're using will be level 8-10 by the time you can do the event, so your sinnoh legendary starts underleveled and tends to stay that way since they take a ton of exp to level up