I checked [the meaning of Farfetch'd on
Bulbapedia](https://bulbapedia.bulbagarden.net/wiki/Farfetch%27d_\(Pok%C3%A9mon\)#Name_origin)
and it says it is "カモネギ", likely to be inspired by "鴨が葱を背負って来る", meaning
"something surprising, but convenient".

What does "surprising but convenient" mean? Is it like an idiom or phrase that
is often used? Can some examples be given how it might be used in daily
speeches in a situation or context?

For example, does it mean good or bad? Can it be: I didn't think it'd rain,
but it suddenly did and made my car clean; it really is 鴨が葱を背負って来る.

I saw [an example of
「あんな高額な商品を買ってくれた上に、家族や友達にまで勧めてくれるなんて、鴨が葱を背負ってくるとはこのことだ」](http://kotowaza-
allguide.com/ka/kamoganegisyotte.html), but I don't quite get what it means.

I also saw [some website explains it as "Along comes a sucker just begging to
be parted from his money"](https://en.bab.la/dictionary/japanese-
english/%E9%B4%A8%E3%81%8C%E3%81%AD%E3%81%8E%E3%82%92%E8%83%8C%E8%B2%A0%E3%81%A3%E3%81%A6%E6%9D%A5%E3%82%8B).
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question
idioms
What does 鴨が葱を背負って来る mean?
Basically it means "easy hunt/game/prey". I think "something surprising but
convenient" is slightly wrong. So it can't be used like your example. Second
example is correct, the phrase exists for.

We love 蕎麦(Japanese noodle), and duck(鴨) meat one is really popular since Edo
period. We usually put 葱(Green leek?) in 蕎麦, so if we found a 鴨 carrying 葱 and
could hunt it, we can get all ingredients for 鴨南蛮(duck meat Soba). It's how
this phrase was born. I know it's impossible. haha.

Also, this phrase is basically used for bad meaning, sneering someone.
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This idiom is understood by virtually all native speakers, but ordinary people
rarely use it. They usually see this phrase used by villains in fictional
works.

鴨 is a duck, and in Japanese it's also a metaphor for a person who is easily
tricked, just like "gull" in English. There is a phrase ～を鴨にする (or ～をカモる for
short), which means "to gull (someone)". 葱 is a type of vegetable [often eaten
with 鴨](https://en.wikipedia.org/wiki/Allium_fistulosum#Japan).

Now I think you can guess the implication of 鴨が葱を背負って来る ("a duck comes
carrying a green onion"). It is a _derogatory_ expression used to describe an
unbelievably convenient situation where someone who the speaker is going to
deceive or harm is innocently and actively doing something beneficial to the
speaker. For example, an evil shogun seeking a magical weapon may say this
when a hero comes to his palace to defeat him holding that very weapon.

Don't use this to praise someone or to describe a lucky situation in general.
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