Are you referring to this report?
https://oversightdemocrats.house.gov/sites/democrats.oversight.house.gov/files/Fact%20Sheet%20re%20Firing%20of%20Viktor%20Shokin.pdfTo be honest, all I can see in this summary are sources form within the Obama/Biden admin (in which Biden had significant freedom and authority on matters related to Ukraine), plus one EU figure welcoming the firing of Shoking after it had already happened, plus some voices from within Ukraine (where anyone in an office like Shokin's would always have plenty of political opponents). So I don't really see any hints for "other Western governments" being after this guy in particular, and the "multiple governments" boil down to the US government (whose handling of Ukraine was managed by Biden) and the Ukrainian government which was aligned with and dependent on them.
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https://www.ft.com/content/e1454ace-e61b-11e9-9743-db5a370481bc European and US officials pressed Ukraine to sack Viktor Shokin, the country’s former prosecutor-general, months before Joe Biden, the former US vice-president, personally intervened to force his removal, people involved in the talks said. Mr Biden did not act unilaterally nor did he instigate the push against Mr Shokin, despite suggestions to the contrary by supporters of US president Donald Trump, people familiar with the matter said.
The circumstances of Mr Shokin’s sacking, which took effect in March 2016, have become a flashpoint in the impeachment saga enveloping US president Donald Trump.
Democrats accuse Mr Trump of putting pressure on Volodymyr Zelensky, the Ukrainian president, to investigate Mr Biden and his son Hunter, who served as a board member of a prominent Ukrainian gas company for several years, to benefit the president’s own re-election campaign in 2020. Mr Trump and his allies, including Rudy Giuliani, his personal lawyer, have retorted that the request was entirely legitimate, arguing that Mr Biden had forced Mr Shokin’s removal by withholding a $1bn loan guarantee, to protect his son from an anti-graft investigation.
EU diplomats working on Ukraine at the time have, however, told the FT that they were looking for ways to persuade Kiev to remove Mr Shokin well before Mr Biden entered the picture. The push for Mr Shokin’s removal was part of an international effort to bolster Ukraine’s institutions following Russia’s annexation of Crimea and the armed conflict in the eastern part of the country.
The decision was welcomed by the EU, which shows that they wanted it to happen obviously. There's articles showing the IMF and EU wanted him gone but it's not as apparent as I recall. I recall the Irish government calling for it but I can't find that. Even still, I don't think there's real evidence that firing the guy had anything to do with Joe Biden looking out for his son.
I guess the best argument is that Biden was doing something, backed up by Obama and other governments, which helped his son. But to pretend it was him on a solo mission is silly.