Hello,
Thought I would share this information...

When I got my Materia it only had one remote so I managed to get a second hand one off eBay. The Materia uses the black 2 button remote Tokai Rika Model C01SA. As far as I can tell its the same remote that most, if not all Daihatsu cars/vans in the UK use (I might be wrong about that).

So I got the remote and all I had to do was program it to my car. After doing some googleing I found the right way to do it - as follows.

1) unlock the car, remove the key from the ignition and shut the doors.

2) disconnect the negative (black) connection from the car battery and leave off for at least 2 minuets.

3) re-connect the negative connection to the battery.

4) press and hold down both buttons on the remote until the car locks and then immediately unlocks its self. Let go of the buttons.

5) press the unlock button. the car will then lock and unlock again.

6) for a second remote repeat from stage 4 immediately.

Notes -
You do have a time limit to get it all done - I don't know how long but if you do everything immediately you should be ok.
when you reconnect the negative battery connection at stage 2 just push it on - don't tighten the bolt up until you've done programing the remote. But don't forget!!!

More than one remote
as I said above I already had one remote and I found that programming the second remote stopped the first one from working.
The instructions I found didn't say anything about a second remote so I had a play and found that the way to get both remotes working was to repeat from stage 4 for the other remote.

Hope that's some help.
and as a disclaimer the above instructions worked for my '09 Materia it may or may not work for any other Daihatsu - and if it all goes wrong please don't blame me!

John