Unable to trade or battle pokemon, how to fix?

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I bought both Ruby and Sapphire for my girlfriend and myself to play.
After getting some medals and catching some Pokemon we decided to trade and battle a bit with Pokemon level 20 and having only 3 medals.
We appeared in the PSS as friends online and we can issue battle or trades, but after accepting a message displays and the attempt is canceled. The message we get is:
Combat/trade canceled any of the participants is missing
- We tried to trade and battle people online and we don't have any problems.
- We used local trading/combat. Tried internet too
- The Pokemon where caught and raised in-game, no hacks nor strange trades with other games.
- I have a 3ds XL and she has a new 3ds XL
- Both games are updated with the latest patch
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Why does it say this Pokémon cant be traded again?
Pok\xe9mon cannot be traded more than once. This is due to the HP and CP changing feature, to stop players "re-rolling a Pok\xe9mon's stats through trade" over and over. Though HP and CP of a Pokemon when traded changes, other aspects - such as size and moves - do not.How do I fix the Y Comm in Pokémon sword?
Trading is an essential feature of all Pokemon games, enhancing the trainer's ability to become more powerful. However, on Pokemon GO, you can only trade with fellow players if they live nearby or 100 meters apart.How to fix Y-COMM ERRORS in Pokemon Sword \u0026 Shield - MAX RAID ERROR \u0026 TRADE ERROR
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Andrea Piacquadio, Javier Leal, Pixabay, Sebastian Voortman