You can delete your Pokemon Conquest save data by pressing (A, B, X, Y.) When you start up Conquest and it says "Nintendo"

When attacking a pokemon hit it from behind or the sides for extra damage, can be very useful in long battles or just picking off weaker pokemon.

In order to beat Nobunaga you must take atvantage of the field and use it to weaken his army as well as healing your forces heres a list
blue does water type effects best to use with the ability water absorb
yellow does electric type move effects best to use when powering up Rhyperior due to lightning rod green and orange does grass and
fire moves to do damage.

You must have beaten the first story to evolve anyone that isnt the main character.

How to Level Up
Only the protagonist can be leveled up to Rank III in the main story.

The rest of the cast can obtain their secondary form in the post-game episodes. Characters require at least 50-80% linkage with their Best Link Pokémon to obtain their secondary rank. Characters with more specific unlocking methods are listed below:

Nobunaga - unlock his scenario and play it. Build 80%+ Link with Hydreigon during his story.
Ginchiyo and Muneshige - keep both characters separated in different castles. 60%+ Link with their respective Best Link Pokémon.
Motonari - collect over 100 Pokémon. 50%+ Link with Servine or Serperior.
Mitsuhide - unlock and finish his episode. 70%+ Link with Lapras or Articuno.
Nene - collect every Poison type Pokémon. 60%+ Link with Golbat or Crobat.
Shingen and Kenshin - unlock and finish both of their personal episodes. 75%+ Link with their respective Best Link Pokémon.
Masamune - unlock his scenario and play it. Build 60%+ Link with Rufflet or Braviary during his story.
Nouhime - collect every Ghost type Pokémon. 60%+ Link with Misdreavus or Mismagius.
Ieyasu - collect 50 characters in the Collection. 70%+ Link with Aggron or Registeel. Do not build link before assembling characters as it may null his chances of leveling up.
Hanbei and Kanbei - keep both characters separated in different castles. 60%+ Link with their respective Best Link Pokémon.
Yukimura - have him and Shingen in the same castle. 65%+ Link with Charmeleon or Charizard.
Magoichi - have him in the same castle as three female characters (protagonist does not count). 60%+ Link with Grovyle or Sceptile.
Kanetsugu - station him and Kenshin in the same castle. 60%+ Link with Kadabra or Alakzam.
Ranmaru - place him in the same castle as Nobunaga. 60%+ Link with Riolu or Lucario.
Tadakatsu - transfer him to a castle which has both Ieyasu and Ina within it. 80%+ Link with Metagross.