If Hikari or
*gasp*Takeshi confessed their love for Shinji to Satoshi, what do you think Satoshi would do? Would he flat out tell them off, unwilling help them with Shinji 'cuz thats just the way he is, or push them off a cliff even? What do you think Shinji would do if he found out? Ignore the affections, flat out tell them off, etc?
Satoshi wouldn't know what to do. As dense as he is he'd probably just stare at his friends like "WTF?". Inside he'd feel hurt but he wouldn't completely understand it since the writers insist that Ash be clueless about love. While Hikari or Takeshi are confessing to Shinji, Ash would probably stand there while his heart is slowly breaking in two.
When Shinji hears the confession he'll be thinking "Sorry I have someone else in mind". He would probably just flat out tell Takeshi off leaving Croagunk to drag the now heart-broken breeder. As for Hikari I think he would clown her. He'd agree to go out with her only to humiliate her out in public. After this is all over Shinji would find Satoshi. Satoshi would want to know why Shinji had hurt his friends' feelings and Shinji would shrug it off and do his usually