Yeah, i have two strange ideas for a future game that are interconnected. In a way, Pokemon Reborn and Generation 0 inspired these ideas.
The first idea is set in a far past.Back in ancient times where there were few humans and many pokemon, pokemon not usually seen nowadays due to them being extinct. You are new to the lands, either coming from far away or from the future itself. You wake up to find that your are being taken care of by a local girl or boy. There, you learn of what happened and that things are going wrong recently because of a certain pokemon clashing with Arceus. This person believes that you have the power to help the land and it people and pokemon by taking down this evil. Now, the evil i talk about is more biblical in the sense that the Evil Pokemon was Arceus's good friend, but then betrayed the God of Pokemon when he was messing with a new pokemon type that goes beyond the Dark type. The Devil Type. Arceus then charges you with taking down the Devil Pokemon and its 7 generals that it corrupted.
Leader: Zerstorer(German for destroyer) Devil Evolution of a Krookodile....looks more like 'evil' dino from Ice Age 3.
Absolon - Devil/PsychicDragon - Looks like a black as night Chinese dragon with 'stars' appearing on it, nicknamed the Millennium Dragon. Has the ability Nightmare Force. In the presence of the Millennium dragon, the target feels the ultimate fear. Fear that you will betrayed by your trainer as they leave you to face the monster alone. Symbol for Treachery/Betrayal.
Ouroboros - Devil/Poison/Steel - Looks like Yamato no Orochi but made out of black/purpish energy and covered in adamanium armor. Symbol for Deception.
Phobos - Devil/Fire - looks like an actual devil with coal for skin, letting it easily set itself on fire. Symbol for Wrath
Mammon - Devil/Dark - Looks like a cross between a three headed dog and a dino. Symbol for Greed.
Relishing - Devil/Normal/Psychic - Looks a little like Slender Man...known as the Blackhole pokemon and a possible devil evolution of Snorlax. Has the ability Freak Out, which causes the victim to go insane.....higher form of counfusion. Symbol for Gluttony
Litith - Devil/Posion/Fairy. known as the Duel Face Pokemon and has the ability to be two different pokemon. Looks like a beautiful fairy in Devil/Fairy Mode while looking like an old witch in Devil/Poison Mode. Has an ability called Ulitmate Charm....able to turn pokemon from their masters. Symbol for Lust.
Malicious - Devil/Ghost - looks like a skeletal horse with a terrifying human face. Symbol for Limbo.
Your job it to seal them all away. While Giratina was just violent, these pokemon are much worse. You will be accompanied by various ancient pokemon and a 'new' pokemon that is the pre-evolution of Mew.
Now the second idea comes from the first. This time, you are a pokemon trainer when Ash's mom was young. That is right, you are the potential father of either Ash or Red...heh. You meet a young Giovanni in his gang and turn Deila away from that gang. however, Team Fuel are setting in motion for the Devil Pokemon to return and you are the one to stop it with your companions Deila and Giovanni. The events lead to dark things happening that will eventually pave the road for Giovanni to create Team Rocket from the remains of Team Fuel.