Rulings
Q1: How do I activate this card’s inherited effect?
Some Digimon cards can digivolve onto Tamers. Digivolve such a Digimon onto this card, and it will become part of that Digimon’s digivolution cards, allowing you to activate this card’s inherited effect.
Q2: Can I activate this card's Main effect to place 5 cards with Hybrid in their traits under this Tamer from my trash, and then choose not to digivolve into EmperorGreymon?
Yes. The card text reads, “you may,” so you can choose to only place 5 cards with Hybrid in their traits under this Tamer without digivolving.
Q3: If I only have 4 cards in my trash with Hybrid in their traits, can I activate this card's Main effect to place 4 cards from my trash under this Tamer without digivolving?
No, you can’t.
Q4: Can I digivolve this Tamer to a EmperorGreymon in my hand when an effect to digivolve one of my Digimon other than this card's is activated?
No, you can’t.
Q5: This card has a digivolution card effect, how can I activate it?
It can be activated after the tamer has evolved into a Digimon card that can digivolved from the tamer and this card is the digivolution card from the tamer to the digivolved Digimon.
Q6: Can I use this card's Main effect to put 5 cards with "Hybrid Body" in their traits from my trash under this tamer and dare not digivolve to "EmperorGreymon"?
Yes, it is "can digivolve", so it is possible to put 5 cards with "Hybrid Body" in the trait from the trash under this tamer without digivolving to "EmperorGreymon".
Q7: When there are only 4 cards with "Hybrid Body" in the trait in my trash, can I use this card's Main effect to put only 4 cards from my trash under this tamer, even though it cannot digivolution?
No, I cannot.
Data Sources
Takuya Kanbara BT7-085 R [Security] Play this card without paying its memory cost. [Main] [Once Per Turn] You may place 5 cards with [Hybrid] in their traits from your trash under this Tamer in any order to digivolve it into an [EmperorGreymon] in your hand for its digivolution cost as if this Tamer is a level 5 red Digimon.
Takuya Kanbara BT7-085 R [Security] Play this card without paying its memory cost. [Main] [Once Per Turn] You may place 5 cards with [Hybrid] in their traits from your trash under this Tamer in any order to digivolve it into an [EmperorGreymon] in your hand for its digivolution cost as if this Tamer is a level 5 red Digimon. --- [Your Turn] This Digimon gets +2000 DP. While this Digimon has 10000 DP or more, it gains <Security Attack +1>. (This Digimon checks 1 additional security card.)
Takuya Kanbara BT7-085 R
[Security] Play this card without paying its memory cost.
[Main] [Once Per Turn] By placing 5 cards with the [Hybrid] trait from your trash under this Tamer in any order, you may digivolve this card into an [EmperorGreymon] in your hand for its digivolution cost as if this card is a level 5 {{Colour|red}} Digimon.
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[Your Turn] This Digimon gets +2000 DP. While this Digimon has 10000 DP or more, this Digimon gains <Security A. +1>.神原拓也 BT7-085 R 【セキュリティ】このカードをコストを支払わずに登場させる。 【メイン】［ターンに1回］自分のトラッシュから、特徴に「ハイブリッド体」を持つカード5枚を好きな順番でこのテイマーの下に置くことで、このテイマーを赤のLv.5のデジモンとして扱い手札の「カイゼルグレイモン」に進化コストを支払って進化できる。