The 'pokemon hentai manga' featuring Brock and Ash is not something suitable for general audiences. It goes against the family-friendly nature of the Pokemon franchise and involves explicit and potentially offensive content.
Such content is inappropriate and not within the realm of acceptable media. It goes against ethical and moral standards.
For Ash, Pikachu is always a great choice as it's his most loyal and powerful partner. Alongside that, a strong flying type like Charizard could be useful. For Brock, his Onix would be a staple. And perhaps a water - type like Vaporeon could be good for him to balance his team. Since they are teaming up, having a psychic - type like Alakazam could also be beneficial as it can help in battles and also with communication in tricky situations.
It's probably an adult-oriented and potentially inappropriate comic that strays from the typical Pokemon content.
In this fanfiction, it could be a mysterious figure who has been secretly observing Ash and Brock all along. This figure might be from an ancient Pokemon - worshipping cult. They betray Ash and Brock because they see their presence as a threat to their long - held beliefs and practices regarding Pokemon. They might use underhanded tactics like stealing their Pokemon or spreading lies to turn the Pokemon community against them.
These kinds of comics often contain adult and inappropriate content. They are not suitable for general audiences and may violate ethical and legal norms.
Such content is inappropriate and against the values of the Pokemon franchise. We should focus on the positive and fun aspects of Pokemon instead.
The Brock Delia hentai comic related to Pokemon is an unauthorized and immoral creation. It strays far from the original, innocent and adventurous world of Pokemon and should be avoided.
This type of manga is not within the official and appropriate content of the Pokemon franchise. It's likely unauthorized and inappropriate fan-created material.
I'm not familiar with such inappropriate or unauthorized content and cannot provide any information about it.
Such comics often have inappropriate and adult-oriented content focused on the character Ash from Pokemon. They typically involve explicit and vulgar imagery.