Beginner-Intermediate Red Deck

Red Hybrid

Win Con: Attack...that's pretty much it. Crash your Rookies and Champions into security, Hybrid digivolve your lvl 4s off of Takuya for more aggresion. Use BT7 Takuya effect to digivolve into EmperorGreymon for the last security checks.

Key Things:

Hybrid Digivolving: All the level 4 digimon have a digivolve condition that lets them digivolve off of a tamer, treating the tamer as a level 3.

Aldamon: Will Always be digivolving for 1 cost instead of 3 due to it's effect. You'll most likely only digivolve into this if you need to go into EmperorGreymon right away to remove an opponent's digimon. It's main purpose is it's inherit effect to turn off security effects when attacking security.

BT7 Takuya Kanbara: It's effect lets you tuck under 5 Hybrid cards underneath to digivolve into EmperorGreymon. It will be your main way to bring out your boss monster. 
To know advanced tech, search up Takuya Cancelling

Boss Monster: BT12 EmperorGreymon - Lets you delete one of your opponent's digimon with DP less than EmperorGreymon due to warping from Takuya's effect. Will gain plenty of DP from it's other hybrid digimon inherits.