Re: would it be possible to port a speech engine to Game Boy Advance?
It's not entirely clear what your question is. It is a good idea to give as much detail as possible in your first post, so we can all be on the same page.
If you mean if you could assemble a GBA game that when played could directly produce spoken synthesized speech output, then no. GBA sound output is very low resolution, so it couldn't produce any sound that could be interpreted as speech. there is a reason that none of the GBA games include any spoken dialogues.
if your goal instead is to run a GBA game on an emulator and hav text displayed in the game to be spoken aloud by your computer, then have a look at the Pokemon Access and the original Pokemon Crystal Access projects.
You can write scripts for emulators that read arbitrary data in the emulated GBA's memory. so if you can figure out where in memory to look for the text being displayed and figure out how to decode it, then you could output it using tolk.
This would have to be done customly for each GBA game, as each organizes data in its memory differently, and might encode text data differently. There are various GBA games that have been disassembled, so you could look at the raw assembly to figure this out.
However let me stress, this is not for the faint of heart. take it from me. I went through Pokemon crystal assembly to extract out all the town maps with their corresponding map ids to create a map names file to work with PCA scripts. that was a relatively easy task and even that took a whole afternoon to figure out.
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