First of all, I wanted to just say how awesome the egg-move information on the Psydex is (especially with all the new improvements). The other reason for this post is to suggest an extra bit of information which I think would significantly enhance its usefulness.

For example, if someone wanted to create a Reversalken (a Blaziken which knows the moves Endure and Reversal), you could use the Psydex to discover that you could do this by
1) levelling up a male Vigoroth until it learns both the moves,
2) after it learns them, breed it with a female Blaziken (or Torchic etc).
The baby will know Endure and Reversal.

On the other hand, if your friend loaned you their (male) Reversalken and you bred it with a female Blaziken, the baby would still be a Reversalken.

However, the Psydex doesn't include Blaziken in the list of egg-move parents for passing on the moves Endure or Reversal.

In light of this example, I think it would be good to know which moves a pokemon can pass on to its young. Obviously it would be ridiculous to change the egg-move section so it has 100 moves, most of which the only parent is Blaziken itself. But perhaps in the Learnset section, there could be an extra column. This column would have a tick or cross depending on whether the move is preserved by breeding (ie if a baby of the same species will have the move when it is born if the parent knows it).

This goes for non-breeding moves also. If a male Treecko is leveled up until it learns Giga Drain (level 46 I think) then you can breed it with a female Treecko and get a Lv 5 Treecko which knows Giga Drain. (Other moves such as Pursuit, and some TMs, can be passed on in this way also.)

What do other people think? Is there a simple rule I have overlooked?

There is a section like this in the breeeding guide. It shows wich moves are passed down and how.

Thanks Tenraikatana - thats exactly what I was after! Problem solved