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Incorrect reasoning. As background, Gen 5 only had differently language’d carts, no region. people do use the language to double as a pseudo-region lock, but not always the case. Wifi: language’d wonder cards were only distributed to games carts of the same language. local: for most cases, language’d wonder cards were only distributed to games carts of the same language. it doesn’t matter if you’re physically there. The exceptions would be WORLDS events (like WORLD CROBAT). If you own a JP 3DS, you can be physically outside of Japan and still receive JP events under that criteria. Those specific look for what 3DS model you’re holding, as opposed to actual physical location. Also, there are exceptions: HKTW events using Nintendo zone & serial code can be received by EU 3DS (language only English), as HKTW imports both JP and EU 3DS. So there are a limited amount of JP events that may be receivable on EU 3DS. This isn’t one of them. Someone can trade you a JP Diancie, there’s no issues there. Just make sure the region is JP, and Geolocation is updated under trainer tab. if you want to redeem the event yourself, yes it has to be EU or Region Free (for Gen 6/7). Anyhow, it you do you good to read the entirety of this:

because region info itself isn't stored on the wonder card, so PKHeX can't check for it. The event can have the wrong region (EU 3DS for example) but it would be incorrectly legal. only if the 3DS region is JP, not EU. And Not Handling OT is your name. I think the geolocation list needs to be updated.

In Gen 6, you could start the game with any language. In most scenarios language isn’t a problem. Language is not an issue in this scenario. Since you did the entire “a person going from Spain” spiel, perhaps you’re confusing language with 3DS region. If you look at the summary image in the description, this is only for JP 3DS. (JP as in the region, not the language) If I’m not mistaken, people in Spain most commonly have access to EU units. Thus, those units won’t be able to receive this event.